API

This section provides detailed information about the ligo.gracedb.rest.GraceDb client class which is the primary method for accessing the GraceDB API.

class ligo.gracedb.rest.GraceDb(service_url='https://gracedb.ligo.org/api/', cred=None, username=None, password=None, force_noauth=False, fail_if_noauth=False, api_version=None, reload_certificate=False, reload_buffer=300)

GraceDb REST client class.

Provides a client object for accessing the GraceDB server API. Various methods are provided for retrieving information about different objects and uploading information.

Lookup of user credentials is done in the following order:

  1. If provided, import X.509 credentials from the certificate-key pair or combined proxy file provided in the cred keyword arg.
  2. If provided, use the username and password provided in the keyword arguments.
  3. If the X509_USER_CERT and X509_USER_KEY environment variables are set, load the corresponding certificate and key.
  4. If the X509_USER_PROXY environment variable is set, load the corresponding proxy file.
  5. Look for a X.509 proxy from ligo-proxy-init in the default location (/tmp/x509up_u${UID}).
  6. Look for a certificate and key file in $HOME/.globus/usercert.pem and $HOME/.globus/userkey.pem.
  7. Look for a username and password for the server in $HOME/.netrc.
  8. Continue with no authentication credentials.
Parameters:
  • url (str, optional) – URL of server API root.
  • cred (tuple or str, optional) – a tuple or list of (/path/to/cert/file, /path/to/key/file) or a single path to a combined proxy file. Used for X.509 authentication only.
  • username (str, optional) – username for basic auth.
  • password (str, optional) – password for basic auth.
  • force_noauth (bool, optional) – set to True if you want to skip credential lookup and use this client without authenticating to the server.
  • fail_if_noauth (bool, optional) – set to True if you want the client constructor to fail if no authentication credentials are provided or found.
  • api_version (str, optional) – choose the version of the server API to use. At present, there is only one version, but this argument is provided with the expectation that this will change in the future.
  • reload_certificate (bool, optional) – if True, your certificate will be checked before each request whether it is within reload_buffer seconds of expiration, and if so, it will be reloaded. Useful for processes which may live longer than the certificate lifetime and have an automated method for certificate renewal. The path to the new/renewed certificate must be the same as for the old certificate.
  • reload_buffer (int, optional) – buffer (in seconds) for reloading a certificate in advance of its expiration. Only used if reload_certificate is True.

Examples

Instantiate a client to use the production GraceDB server:

>>> g = GraceDb()

/se another GraceDB server:

>>> g = GraceDb(service_url='https://gracedb-playground.ligo.org/api/')

Use a certificate and key in the non-default location:

>>> g = GraceDb(cred=('/path/to/cert/file', '/path/to/key/file'))
addEventToSuperevent(superevent_id, graceid)

Add an event to a superevent.

The event must be in the same category as the superevent and must not already be part of a superevent.

Parameters:
  • superevent_id (str) – GraceDB ID of the superevent to which the event will be added.
  • graceid (str) – graceid of the event to add to this superevent.
Returns:

requests.models.Response

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

>>> g = GraceDb()
>>> r = addEventToSuperevent('S181224a', 'G123456')
>>> r.status_code
201
addTag(object_id, N, tag_name, displayName=None, *args, **kwargs)

Add a tag to an event or superevent log entry.

Parameters:
  • object_id (str) – event graceid or superevent ID.
  • N (int) – ID number of log entry.
  • tag_name (str) – name of tag to add; tags which don’t already exist on the server will be created.
  • displayName (str, optional) – tag display name; only used to create new tags which don’t already exist.
Returns:

requests.models.Response

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

>>> g = GraceDb()
>>> r = g.createTag('T101383', 56, 'sky_loc')
>>> r.status
201
allowed_labels

List of available labels on the server.

api_versions

List of available API versions on the server.

close()

Closes all adapters and as such the session

confirm_superevent_as_gw(superevent_id)

Upgrade a superevent’s state to ‘confirmed GW’.

All LIGO-Virgo users can perform this action on test superevents, but special permissions are required for production and MDC superevents. This action cannot be undone!

Parameters:superevent_id (str) – GraceDB ID of the superevent to confirm as as GW.
Returns:requests.models.Response
Raises:ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

>>> g = GraceDb()
>>> r = confirm_superevent_as_gw('S181224a')
>>> r.status_code
204
createEvent(group, pipeline, filename, search=None, labels=None, offline=False, filecontents=None, **kwargs)

Create a new event on the server.

All LIGO-Virgo users can create events in the ‘Test’ group. Special permissions are required to create non-test events.

Parameters:
  • group (str) – name of the analysis group which identified the candidate.
  • pipeline (str) – name of the analysis pipeline which identified the candidate.
  • filename (str) – path to event file to be uploaded. Use '-' to read from stdin.
  • search (str, optional) – type of search being run by the analysis pipeline.
  • labels (str or list[str], optional) – label(s) to attach to the event upon creation. Should be a string (single label) or list of strings (multiple labels).
  • offline (bool, optional) – if True, indicates that the event was found by an offline analysis.
  • filecontents (str, optional) – string to be uploaded to the server and saved into a file. If event data is uploaded via this mechanism, the filename argument is only used to set the name of the file once it is saved on the server.
Returns:

requests.models.Response

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

>>> g = GraceDb()
>>> r = g.createEvent('CBC', 'gstlal', '/path/to/something.xml',
... labels='INJ', search='LowMass')
>>> r.status_code
201
createSuperevent(t_start, t_0, t_end, preferred_event, category='production', events=None, labels=None)

Create a superevent.

All LIGO-Virgo users can create test superevents, but special permissions are required to create production and MDC superevents.

Parameters:
  • t_start (float) – tstart of the superevent
  • t_0 (float) – t0 of the superevent
  • t_end (float) – tend of the superevent
  • preferred_event (str) – graceid corresponding to the event which will be set as the preferred event for this superevent. This event must be in the same category as the superevent and not already attached to a superevent.
  • category (str, optional) – superevent category. Allowed choices are: ‘production’, ‘test’, ‘mdc’.
  • events (str or list[str], optional) – graceid or list of graceids corresponding to events which should be included in this superevent. Events must be in the same category as the superevent and not already attached to a superevent.
  • labels (str or list[str], optional) – label or list of labels which should be attached to this superevent at creation.
Returns:

requests.models.Response

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

>>> g = GraceDb()
>>> r = g.createSuperevent(1, 2, 3, 'G123456',
... category='production', events=['G100', 'G101'],
... labels=['EM_READY', 'DQV'])
>>> r.status_code
201
createVOEvent(object_id, voevent_type, skymap_type=None, skymap_filename=None, combined_skymap_filename=None, internal=True, open_alert=False, raven_coinc=False, hardware_inj=False, CoincComment=False, ProbHasNS=None, ProbHasRemnant=None, BNS=None, NSBH=None, BBH=None, Terrestrial=None, MassGap=None, *args, **kwargs)

Create a new VOEvent.

Parameters:
  • object_id (str) – event graceid or superevent ID.
  • voevent_type (str) – VOEvent type (choose from 'preliminary', 'initial', 'update', and 'retraction').
  • skymap_type (str, optional) – skymap type. Required for VOEvents which include a skymap.
  • skymap_filename (str, optional) – name of skymap file on the GraceDB server (required for ‘initial’ and ‘update’ alerts, optional for ‘preliminary’ alerts).
  • combined_skymap_file (str, optional) – name of combined skymap file, if present
  • internal (bool, optional) – whether the VOEvent should be distributed to LIGO-Virgo members only.
  • hardware_inj (bool, optional) – whether the candidate is a hardware injection.
  • open_alert (bool, optional) – whether the candidate is an open alert or not.
  • raven_coinc (bool, optional) – is VOEvent result of coincidence from RAVEN pipeline. Tells GraceDB to look for coinc_far and em_type data models.
  • CoincComment (bool, optional) – whether the candidate has a possible counterpart GRB.
  • ProbHasNS (float, optional) – probability that at least one object in the binary is less than 3 Msun (CBC events only).
  • ProbHasRemnant (float) – probability that there is matter in the surroundings of the central object (CBC events only).
  • BNS (float, optional) – probability that the source is a binary neutron star merger (CBC events only).
  • NSBH (float, optional) – probability that the source is a neutron star-black hole merger (CBC events only).
  • BBH (float, optional) – probability that the source is a binary black hole merger (CBC events only).
  • Terrestrial (float, optional) – probability that the source is terrestrial (i.e., a background noise fluctuation or a glitch) (CBC events only).
  • MassGap (float, optional) – probability that at least one object in the binary has a mass between 3 and 5 Msun (CBC events only).
Returns:

requests.models.Response

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

>>> g = GraceDb()
>>> r = g.createVOEvent('T101383', 'initial', skymap_type='custom',
... skymap_filename='skymap.fits.gz', internal=True, ProbHasNS=0.7,
... MassGap=0.4, Terrestrial=0.05)
>>> r.status
201
create_signoff(object_id, signoff_type, status, comment, instrument='', *args, **kwargs)

Create a superevent signoff.

This action requires special server-side permissions. You must be in the control room of an IFO to perform operator signoffs or in the ‘em_advocates’ group to perform advocate signoffs. This action is not yet implemented for events.

Parameters:
  • object_id (str) – superevent ID.
  • signoff_type (str) – signoff type. Choices are: 'OP' or 'operator' (operator signoff), or 'ADV' or 'advocate' (advocate signoff).
  • status (str) – signoff status ('OK' or 'NO').
  • comment (str) – comment on the signoff.
  • instrument (str, optional) – instrument abbreviation ('H1', 'L1', etc.) for operator signoffs. Leave blank for advocate signoffs.
Returns:

requests.models.Response

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

>>> g = GraceDb()
>>> r = g.create_signoff('S190102p', 'OP', 'OK',
... 'LHO looks good.', instrument='H1')
>>> r.status_code
201
delete(url, **kwargs)

Sends a DELETE request. Returns Response object.

Parameters:
  • url – URL for the new Request object.
  • **kwargs – Optional arguments that request takes.
Return type:

requests.Response

delete_signoff(object_id, signoff_type, instrument='', *args, **kwargs)

Delete a superevent signoff.

This action requires the same permissions as create_signoff().

Parameters:
  • object_id (str) – superevent ID.
  • signoff_type (str) – signoff type. Choices are: 'OP' or 'operator' (operator signoff), or 'ADV' or 'advocate' (advocate signoff).
  • instrument (str, optional) – instrument abbreviation ('H1', 'L1', etc.) for operator signoffs. Leave blank for advocate signoffs.
Returns:

requests.models.Response

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

>>> g = GraceDb()
>>> r = g.delete_signoff('S190102p', 'OP', instrument='H1')
>>> r.status_code
204
em_groups

List of available EM groups on the server.

emobservations(object_id, emobservation_num=None, *args, **kwargs)

Get EM observation data associated with an event or superevent.

If emobservation_num is provided, get a single EM observation data entry. Otherwise, retrieve all EM observation data associated with the event or superevent in question.

Parameters:
  • object_id (str) – event graceid or superevent ID.
  • emobservation_num (int, optional) – ID number (N) of the EM observation to retrieve.
Returns:

requests.models.Response

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Examples

Get a list of EM observations:

>>> g = GraceDb()
>>> r = g.emobservations('T101383')
>>> full_dictionary = r.json()
>>> emo_list = full_dictionary['observations']

Get a single EM observation:

>>> g = GraceDb()
>>> r = g.emobservations('T101383', 2)
>>> observation_dict = r.json()
event(graceid)

Get information about an individual event.

Parameters:graceid (str) – GraceDB ID of the event
Returns:httplib.HTTPResponse
Raises:ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

>>> g = GraceDb()
>>> event_dict = g.event('T101383').json()
events(query=None, orderby=None, max_results=None, **kwargs)

Search for events which match a query.

Information on forming queries is available here: https://gracedb.ligo.org/documentation/queries.html

Parameters:
  • query (str, optional) – query string.
  • orderby (str, optional) – field to order the results by.
  • max_results (int, optional) – maximum number of results to return (default: all).
Returns:

Iterator[dict]

An iterator which yields individual event dictionaries.

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

>>> g = GraceDb()
>>> for event in g.events('ER5 submitter: "gstlalcbc"'):
...     print(event['graceid'], event['far'], event['gpstime'])
files(object_id, filename='', *args, **kwargs)

Get a list of files or download a file associated with an event or superevent.

If filename is not provided, get a list of available files associated with the event or superevent. If filename is provided, download the contents of that file.

Parameters:
  • object_id (str) – event graceid or superevent ID.
  • filename (str, optional) – name of file to download.
Returns:

requests.models.Response

When filename is not specified, response.json() contains a dict with file basename keys and full file URL values. When filename is specified, use response.read() to get the contents of the file.

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Examples

Get a list of files:

>>> g = GraceDb()
>>> event_files = g.files('T101383').json()
>>> for filename in list(event_files):
...     # do something
...     pass

Get a file’s content:

>>> outfile = open('my_skymap.png', 'w')
>>> r = g.files('T101383', 'skymap.png')
>>> outfile.write(r.content)
>>> outfile.close()
get(url, **kwargs)

Sends a GET request. Returns Response object.

Parameters:
  • url – URL for the new Request object.
  • **kwargs – Optional arguments that request takes.
Return type:

requests.Response

get_adapter(url)

Returns the appropriate connection adapter for the given URL.

Return type:requests.adapters.BaseAdapter
get_redirect_target(resp)

Receives a Response. Returns a redirect URI or None

get_user_info()

Get information from the server about your user account.

groups

List of available analysis groups on the server.

head(url, **kwargs)

Sends a HEAD request. Returns Response object.

Parameters:
  • url – URL for the new Request object.
  • **kwargs – Optional arguments that request takes.
Return type:

requests.Response

instruments

List of available instruments on the server.

labels(object_id, label='', *args, **kwargs)

Get a label or labels attached to an event or superevent.

Parameters:
  • object_id (str) – event graceid or superevent ID.
  • label (str, optional) – name of label.
Returns:

requests.models.Response

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Examples

Get a list of labels:

>>> g = GraceDb()
>>> label_list = g.labels('T101383').json()['labels']
>>> for label in label_list:
...     print label['name']

Get a single label:

>>> g = GraceDb()
>>> dqv_label = g.labels('T101383', 'DQV').json()
classmethod load_json_from_response(response)

Always return a json content response, even when the server provides a 204: no content

logs(object_id, log_number=None, *args, **kwargs)

Get log entries associated with an event or superevent.

If log_number is specified, only a single log message is returned. Otherwise, all log messages attached to the event or superevent in question are returned.

Parameters:
  • object_id (str) – event graceid or superevent ID.
  • log_number (int, optional) – ID number (N) of the log entry to retrieve.
Returns:

requests.models.Response

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Examples

Get all log messages:

>>> g = GraceDb()
>>> response_dict = g.logs('T101383').json()
>>> print "Num logs = %d" % response_dict['numRows']
>>> log_list = response_dict['log']
>>> for log in log_list:
...     print log['comment']

Get a single log message:

>>> g = GraceDb()
>>> log_info = g.logs('T101383', 10).json()
merge_environment_settings(url, proxies, stream, verify, cert)

Check the environment and merge it with some settings.

Return type:dict
modify_permissions(object_id, action, *args, **kwargs)

Expose or hide a superevent to/from the public.

This action requires special server-side permissions. It is not yet implemented for events.

Parameters:
  • object_id (str) – superevent ID.
  • action (str) – 'expose' or 'hide'.
Returns:

httplib.HTTPResponse

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

Expose a superevent:

>>> g = GraceDb()
>>> g.modify_permissions('S190304bc', 'expose').json()
[
    {'group': 'group1', 'permission': 'view_superevent'},
    {'group': 'group1', 'permission': 'annotate_superevent'},
    {'group': 'group2', 'permission': 'view_superevent'},
]

Hide a superevent:

>>> g.modify_permissions('S190304bc', 'hide').json()
[]
mount(prefix, adapter)

Registers a connection adapter to a prefix.

Adapters are sorted in descending order by prefix length.

numEvents(query=None)

Get the number of events satisfying a query.

Parameters:query (str, optional) – query string.
Returns:The number of events which matched the given query.
Return type:int
Raises:ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

>>> g = GraceDb()
>>> g.numEvents('ER5 submitter: "gstlalcbc"')
213
options(url, **kwargs)

Sends a OPTIONS request. Returns Response object.

Parameters:
  • url – URL for the new Request object.
  • **kwargs – Optional arguments that request takes.
Return type:

requests.Response

patch(url, data=None, **kwargs)

Sends a PATCH request. Returns Response object.

Parameters:
  • url – URL for the new Request object.
  • data – (optional) Dictionary, list of tuples, bytes, or file-like object to send in the body of the Request.
  • **kwargs – Optional arguments that request takes.
Return type:

requests.Response

permissions(object_id, *args, **kwargs)

Get a list of permissions for a superevent.

Only LIGO-Virgo members are allowed to access this information. This is not currently implemented for events.

Parameters:object_id (str) – superevent ID.
Returns:requests.models.Response
Raises:ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

>>> g = GraceDb()
>>> g.permissions('S190304bc').json()['permissions']
[
    {'group': 'group1', 'permission': 'view_superevent'},
    {'group': 'group1', 'permission': 'annotate_superevent'},
    {'group': 'group2', 'permission': 'view_superevent'},
]
ping()

Ping the server.

Returns:requests.models.Response

response.json() contains the information from the API root.

Raises:ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.
pipelines

List of available analysis pipelines on the server.

post(url, data=None, json=None, **kwargs)

Sends a POST request. Returns Response object.

Parameters:
  • url – URL for the new Request object.
  • data – (optional) Dictionary, list of tuples, bytes, or file-like object to send in the body of the Request.
  • json – (optional) json to send in the body of the Request.
  • **kwargs – Optional arguments that request takes.
Return type:

requests.Response

prepare_request(request)

Constructs a PreparedRequest for transmission and returns it. The PreparedRequest has settings merged from the Request instance and those of the Session.

Parameters:requestRequest instance to prepare with this session’s settings.
Return type:requests.PreparedRequest
put(url, data=None, **kwargs)

Sends a PUT request. Returns Response object.

Parameters:
  • url – URL for the new Request object.
  • data – (optional) Dictionary, list of tuples, bytes, or file-like object to send in the body of the Request.
  • **kwargs – Optional arguments that request takes.
Return type:

requests.Response

rebuild_auth(prepared_request, response)

When being redirected we may want to strip authentication from the request to avoid leaking credentials. This method intelligently removes and reapplies authentication where possible to avoid credential loss.

rebuild_method(prepared_request, response)

When being redirected we may want to change the method of the request based on certain specs or browser behavior.

rebuild_proxies(prepared_request, proxies)

This method re-evaluates the proxy configuration by considering the environment variables. If we are redirected to a URL covered by NO_PROXY, we strip the proxy configuration. Otherwise, we set missing proxy keys for this URL (in case they were stripped by a previous redirect).

This method also replaces the Proxy-Authorization header where necessary.

Return type:dict
removeEventFromSuperevent(superevent_id, graceid)

Remove an event from a superevent.

The event must already be a part of the superevent.

Parameters:
  • superevent_id (str) – GraceDB ID of the superevent from which the event will be removed.
  • graceid (str) – graceid of the event to remove from this superevent.
Returns:

requests.models.Response

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

>>> g = GraceDb()
>>> r = removeEventFromSuperevent('S181224a', 'G123456')
>>> r.status_code
204
removeLabel(object_id, label, *args, **kwargs)

Remove a label from an event or superevent.

Parameters:
  • object_id (str) – event graceid or superevent ID.
  • label (str) – label name. The label must be presently applied to the event or superevent.
Returns:

requests.models.Response

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

>>> g = GraceDb()
>>> r = g.removeLabel('T101383', 'DQV')
>>> r.status_code
204
removeTag(object_id, N, tag_name, *args, **kwargs)

Remove a tag from an event or superevent log entry.

Parameters:
  • object_id (str) – event graceid or superevent ID.
  • N (int) – ID number of log entry.
  • tag_name (str) – name of tag to add; tags which don’t already exist on the server will be created.
Returns:

requests.models.Response

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

>>> g = GraceDb()
>>> r = g.deleteTag('T101383', 56, 'sky_loc')
>>> r.status
200
replaceEvent(graceid, filename, filecontents=None)

Replace an existing event by uploading a new event file.

The event’s parameters are updated from the new file. Only the user who originally created the event can update it.

Parameters:
  • graceid (str) – GraceDB ID of the existing event
  • filename (str) – path to new event file
  • filecontents (str, optional) – string to be uploaded to the server and saved into a file. If event data is uploaded via this mechanism, the filename argument is only used to set the name of the file once it is saved on the server.
Returns:

requests.models.Response

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

>>> g = GraceDb()
>>> r = g.replaceEvent('T101383', '/path/to/new/something.xml')
request(method, url, params=None, data=None, headers=None, cookies=None, files=None, auth=None, timeout=None, allow_redirects=True, proxies=None, hooks=None, stream=None, verify=None, cert=None, json=None)

Constructs a Request, prepares it and sends it. Returns Response object.

Parameters:
  • method – method for the new Request object.
  • url – URL for the new Request object.
  • params – (optional) Dictionary or bytes to be sent in the query string for the Request.
  • data – (optional) Dictionary, list of tuples, bytes, or file-like object to send in the body of the Request.
  • json – (optional) json to send in the body of the Request.
  • headers – (optional) Dictionary of HTTP Headers to send with the Request.
  • cookies – (optional) Dict or CookieJar object to send with the Request.
  • files – (optional) Dictionary of 'filename': file-like-objects for multipart encoding upload.
  • auth – (optional) Auth tuple or callable to enable Basic/Digest/Custom HTTP Auth.
  • timeout (float or tuple) – (optional) How long to wait for the server to send data before giving up, as a float, or a (connect timeout, read timeout) tuple.
  • allow_redirects (bool) – (optional) Set to True by default.
  • proxies – (optional) Dictionary mapping protocol or protocol and hostname to the URL of the proxy.
  • stream – (optional) whether to immediately download the response content. Defaults to False.
  • verify – (optional) Either a boolean, in which case it controls whether we verify the server’s TLS certificate, or a string, in which case it must be a path to a CA bundle to use. Defaults to True.
  • cert – (optional) if String, path to ssl client cert file (.pem). If Tuple, (‘cert’, ‘key’) pair.
Return type:

requests.Response

resolve_redirects(resp, req, stream=False, timeout=None, verify=True, cert=None, proxies=None, yield_requests=False, **adapter_kwargs)

Receives a Response. Returns a generator of Responses or Requests.

searches

List of available search types on the server.

send(request, **kwargs)

Send a given PreparedRequest.

Return type:requests.Response
server_version

Get the code version being run on the GraceDB server.

service_info

Gets the root API information.

should_strip_auth(old_url, new_url)

Decide whether Authorization header should be removed when redirecting

show_credentials(print_output=True)

Prints authentication type and credentials info.

signoff_statuses

List of available signoff statuses on the server.

signoff_types

List of available signoff types on the server.

signoffs(object_id, signoff_type=None, instrument='', *args, **kwargs)

Get a signoff or list of signoffs for a superevent.

This action is not yet implemented for events.

Parameters:
  • object_id (str) – superevent ID.
  • signoff_type (str) – signoff type. Choices are: 'OP' or 'operator' (operator signoff), or 'ADV' or 'advocate' (advocate signoff).
  • instrument (str, optional) – instrument abbreviation ('H1', 'L1', etc.) for operator signoffs. Leave blank for advocate signoffs.
Returns:

requests.models.Response

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

Get a list of signoffs:

>>> g = GraceDb()
>>> signoffs = g.signoffs('S190221z').json()['signoffs']

Get a single signoff:

>>> signoff = g.signoffs('S190221z', 'H1').json()
superevent(superevent_id)

Get information about an individual superevent.

Parameters:superevent_id (str) – GraceDB ID of the superevent.
Returns:httplib.HTTPResponse
Raises:ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

>>> g = GraceDb()
>>> superevent = g.superevent('S181224a').json()
superevent_categories

List of available superevent categories on the server.

superevents(query='', orderby=None, count=None, columns=None, max_results=None)

Search for superevents which match a query.

Information on forming queries is available here: https://gracedb.ligo.org/documentation/queries.html

Parameters:
  • query (str, optional) – query string.
  • orderby (str, optional) – field to order the results by.
  • count (int, optional) – each generator iteration will yield this many objects (default determined by the server).
  • columns (list[str], optional) – list of attributes to return for each superevent (default: all).
  • max_results (int, optional) – maximum number of results to return (default: all).
Returns:

Iterator[dict]

An iterator which yields individual superevent dictionaries.

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

>>> g = GraceDb()
>>> for s in g.superevents(query='is_gw: True', orderby=
... ['-preferred_event'], columns=['superevent_id', 'events']):
...     print(s['superevent_id'])
tags(object_id, N, *args, **kwargs)

Get tags attached to an event or superevent log entry.

Parameters:
  • object_id (str) – event graceid or superevent ID.
  • N (int) – ID number (N) of the log entry for which to get tags.
Returns:

requests.models.Response

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

>>> g = GraceDb()
>>> tag_list = g.tags('T101383', 56).json()['tags']
>>> print "Number of tags for message 56: %d" % len(tag_list)
updateSuperevent(superevent_id, t_start=None, t_0=None, t_end=None, preferred_event=None, em_type=None, time_coinc_far=None, space_coinc_far=None)

Update a superevent’s parameters.

The same permission restrictions apply as for ligo.gracedb.rest.GraceDb.createSuperevent(). You must provide at least one parameter value to update, otherwise the request will be rejected for not providing any new information.

Parameters:
  • superevent_id (str) – GraceDB ID of superevent to update
  • t_start (float, optional) – new tstart value for superevent
  • t_0 (float, optional) – new t0 value for superevent
  • t_end (float, optional) – new tend value for superevent
  • preferred_event (str, optional) – graceid corresponding to an event which will be set as the new preferred event for this superevent. This event must be in the same category as the superevent ('production', 'test', 'mdc') and must either already be a part of this superevent, or not be in a superevent at all.
  • em_type (str, optional) – name of coincident EM search for “preferred” EM coincident event. Defined by analyst or pipeline (e.g., RAVEN). Default is null for new superevents.
  • time_coinc_far (float, optional) – new value for temporal coincident FAR with preferred EM coincident event. Defined by analyst or pipeline (e.g., RAVEN). Default is null for new superevents.
  • space_coinc_far (float, optional) – new value for temporal coincident FAR with preferred EM coincident event. Defined by analyst or pipeline (e.g., RAVEN). Default is null for new superevents.
Returns:

requests.models.Response

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

>>> g = GraceDb()
>>> r = g.updateSuperevent('S181224a', t_start=12, preferred_event=
... 'G654321')
>>> r.status_code
200
update_grbevent(graceid, ra=None, dec=None, error_radius=None, t90=None, redshift=None, designation=None)

Update a GRB event’s parameters.

This method only works on GRB events; i.e., External or Test events whose search is specified as ‘GRB’.

Only LIGO/Virgo users with permission to update GRB events will be able to utilize this method.

Parameters:
  • graceid (str) – GraceDB ID of the existing event
  • ra (float, optional) – right ascension (degrees)
  • dec (float, optional) – declination (degrees)
  • error_radius (float, optional) – uncertainty in position as statistical ~1-sigma error radius from the reported right ascension and declination (degrees)
  • t90 (float, optional) – duration of the event in which 90% of the gamma-ray burst fluence was accumulated (seconds)
  • redshift (float, optional) – redshift
  • designation (str, optional) – name of the event, typically reported in GRByymmddx (where x is null, ‘A’, or ‘B’) or GRByymmddfff format, where fff is the three-digit fraction of the day
Returns:

requests.models.Response

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

>>> g = GraceDb()
>>> r = g.update_grbevent('E274955', redshift=2.33, ra=135.91)
>>> r.status
200
update_signoff(object_id, signoff_type, status=None, comment=None, instrument='', *args, **kwargs)

Update a superevent signoff.

This action requires the same permissions as ligo.gracedb.rest.GraceDb.create_signoff().

Parameters:
  • object_id (str) – superevent ID.
  • signoff_type (str) – signoff type. Choices are: 'OP' or 'operator' (operator signoff), or 'ADV' or 'advocate' (advocate signoff).
  • status (str, optional) – signoff status (if changed).
  • comment (str, optional) – comment on the signoff (if changed).
  • instrument (str, optional) – instrument abbreviation ('H1', 'L1', etc.) for operator signoffs. Leave blank for advocate signoffs.
Returns:

requests.models.Response

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

>>> g = GraceDb()
>>> r = g.update_signoff('S190102p', 'OP', status='NO',
... comment='IFO status was actually bad.', instrument='H1')
>>> r.status_code
200
voevent_types

List of available VOEvent types on the server.

voevents(object_id, voevent_num=None, *args, **kwargs)

Get a VOEvent or list of VOEvents for an event or superevent.

To get the XML file associated with a VOEvent, use the filename in the response JSON with ligo.gracedb.rest.GraceDb.files().

Parameters:
  • object_id (str) – event graceid or superevent ID.
  • voevent_num (int, optional) – ID number (N) of the VOEvent to retrieve.
Returns:

requests.models.Response

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Examples

Get a list of VOEvents:

>>> g = GraceDb()
>>> r = g.voevents('T101383')
>>> voevent_list = r.json()['voevents']

Get a single VOEvent:

>>> g = GraceDb()
>>> r = g.voevents('T101383', 2)
>>> voevent = r.json()
writeEMObservation(object_id, group, raList, raWidthList, decList, decWidthList, startTimeList, durationList, comment='', *args, **kwargs)

Create an EM observation data entry for an event or superevent.

Parameters:
  • object_id (str) – event graceid or superevent ID.
  • group (str) – name of EM MOU group making the observation.
  • raList (list[float]) – list of right ascension coordinates (degrees).
  • raWidthList (list[float] or float) – list of right ascension measurement widths OR a single number if all measurements have the same width (degrees).
  • decList (list[float]) – list of declination coordinates (degrees).
  • decWidthList (list[float] or float) – list of declination measurement widths OR a single number if all measurements have the same width (degrees).
  • startTimeList (list[str]) – list of measurement start times in ISO 8601 format and UTC time zone.
  • durationList (list[float] or float) – list of exposure times OR a single number if all measurements have the same exposure (seconds).
  • comment (str, optional) – comment on observation.
Returns:

requests.models.Response

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

>>> g = GraceDb()
>>> r = g.writeEMObservation('S190131g', 'ZTF', [1, 2, 3],
... [0.1, 0.1, 0.1], [4, 5, 6], 0.2, [],
... [10, 9, 11], comment="data uploaded")
>>> r.status
201
writeLabel(object_id, label, *args, **kwargs)

Add a label to an event or superevent.

Parameters:
Returns:

requests.models.Response

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

>>> g = GraceDb()
>>> r = g.writeLabel('T101383', 'DQV')
>>> r.status_code
201
writeLog(object_id, message, filename=None, filecontents=None, tag_name=[], displayName=[], *args, **kwargs)

Create a new log entry associated with an event or superevent.

Parameters:
  • object_id (str) – event graceid or superevent ID.
  • message (str) – comment to post.
  • filename (str, optional) – path to file to be uploaded. Use '-' to read from stdin.
  • filecontents (file, optional) – handler pointing to a file to be read and uploaded. If this argument is specified, the contents will be saved as filename on the server.
  • tag_name (str or list[str], optional) – tag name or list of tag names to be applied to the log message.
  • displayName (str or list[str], optional) – tag display string or list of display strings for the tag(s) in tag_name. If provided, there should be one for each tag. Not applicable for tags which already exist on the server.
Returns:

requests.models.Response

Raises:

ligo.gracedb.exceptions.HTTPError – if the response has a status code >= 400.

Example

>>> g = GraceDb()
>>> r = g.writeLog('T101383', 'Good stuff.', '/path/to/plot.png',
... tag_name='analyst_comments')
>>> print r.status_code
201

A separate GraceDbBasic class had been provided in the past for password-based authentication, but that functionality is now included in the GraceDb class. ligo.gracedb.rest.GraceDbBasic is still provided for legacy compatibility, but it is now an exact duplicate of the ligo.gracedb.rest.GraceDb class.