gwcelery.tasks.external_triggers module
This module listens to the GCNs from SNEWS and the Fermi, Swift, INTEGRAL,
and AGILE missions. It is also responsible for carrying out tasks related to
external trigger-gravitational wave coincidences, including looking for
temporal coincidences, creating combined GRB-GW sky localization probability
maps, and computing their joint temporal and spatio-temporal false alarm
rates.
There are two GCN and two LVAlert message handlers in the
~gwcelery.tasks.external_triggers module:
Flow Chart
digraph exttrig {
compound = true
nodesep = 0.1
ranksep = 0.1
node [
fillcolor = white
shape = box
style = filled
target = "_top"
]
graph [
labeljust = "left"
style = filled
target = "_top"
]
SNEWS_GCN [
style="rounded"
label="SNEWS GCN recieved"
]
GRB_GCN [
style="rounded"
label="GRB\nGCN recieved"
]
subgraph cluster_gcn_handle {
href = "../gwcelery.tasks.external_triggers.html#gwcelery.tasks.external_triggers.handle_gcn"
label = <<B><FONT face="monospace">handle_gcn</FONT></B>>
Ignore_gcn [
label="Ignore"
]
Likely_noise [
shape=diamond
label="Is the event\nlikely non-astrophysical?"
]
Event_exists_in_Gracedb [
shape=diamond
label="Does the event already\nexist in gracedb"
]
Update_existing_event_in_gracedb [
label="Update the existing\nevent in gracedb"
]
Create_new_event_in_gracedb [
label="Create a new event\nin gracedb"
]
Grab_create_skymap [
label="Grab and/or\ncreate external sky map"
]
}
SNEWS_GCN -> Likely_noise [
lhead = cluster_gcn_handle
]
GRB_GCN -> Likely_noise [
lhead = cluster_gcn_handle
]
Likely_noise -> Event_exists_in_Gracedb[label="no"]
Likely_noise -> Ignore_gcn[label="yes"]
Event_exists_in_Gracedb -> Update_existing_event_in_gracedb[label="yes"]
Event_exists_in_Gracedb -> Create_new_event_in_gracedb[label="no"]
Update_existing_event_in_gracedb -> Grab_create_skymap
Create_new_event_in_gracedb -> Grab_create_skymap
GRB_External_Trigger_or_Superevent_LVAlert [
style="rounded"
label="GRB external trigger or\nSuperevent LVAlert received"
]
subgraph cluster_grb_lvalert_handle {
href = "../gwcelery.tasks.external_triggers.html#gwcelery.tasks.external_triggers.handle_grb_lvalert"
label = <<B><FONT face="monospace">handle_grb_lvalert</FONT></B>>
Ignore [
label="Ignore"
]
Is_New_LVAlert [
shape=diamond
label="Is this a\nnew type LVAlert?"
]
Is_Swift_Subthresh_LVAlert [
shape=diamond
label="Is this a\nSwift Targeted Subthreshold\nLVAlert?"
]
Create_Swift_Skymap [
label="Create Swift sky map"
]
Is_Label_Exttrig_LVAlert [
shape=diamond
label="Is this a label type\nexternal event LVAlert?"
]
Perform_Raven_Search [
label="Perform Raven\ncoincidence search(es)"
]
Does_Label_Launch_Pipeline [
shape=diamond
label="Does label complete the\nset indicating a coincidence and both\nsky maps are available?"
]
Launch_Raven_Pipeline [
label="Launch Raven\nPipeline"
]
Does_Label_Launch_Combined_Skymaps [
shape=diamond
label="Does label complete the\nset indicating RAVEN alert and both\nsky maps are available?"
]
Create_Combined_Skymap [
label="Create combined GW-GRB\nsky map"
]
}
GRB_External_Trigger_or_Superevent_LVAlert -> Is_New_LVAlert [
lhead = cluster_grb_lvalert_handle
]
Is_New_LVAlert -> Is_Swift_Subthresh_LVAlert[label="yes"]
Is_Swift_Subthresh_LVAlert -> Create_Swift_Skymap[label="yes"]
Create_Swift_Skymap -> Perform_Raven_Search
Is_Swift_Subthresh_LVAlert -> Perform_Raven_Search[label="no"]
Is_New_LVAlert -> Is_Label_Exttrig_LVAlert[label="no"]
Is_Label_Exttrig_LVAlert -> Does_Label_Launch_Pipeline[label="yes"]
Is_Label_Exttrig_LVAlert -> Ignore[label="no"]
Does_Label_Launch_Pipeline -> Launch_Raven_Pipeline[label="yes"]
Does_Label_Launch_Pipeline -> Does_Label_Launch_Combined_Skymaps[label="no"]
Launch_Raven_Pipeline -> Does_Label_Launch_Combined_Skymaps
Does_Label_Launch_Combined_Skymaps -> Create_Combined_Skymap[label="yes"]
Does_Label_Launch_Combined_Skymaps -> Ignore[label="no"]
SNEWS_External_Trigger_or_Superevent_LVAlert [
style="rounded"
label="SNEWS external trigger or\nSuperevent LVAlert received"
]
subgraph cluster_snews_lvalert_handle {
href = "../gwcelery.tasks.external_triggers.html#gwcelery.tasks.external_triggers.handle_snews_lvalert"
label = <<B><FONT face="monospace">handle_snews_lvalert</FONT></B>>
ignore [
label="Ignore"
]
is_new_exttrig_lvalert [
shape=diamond
label="Is this a new type SNEWS\nexternal trigger LVAlert?"
]
is_new_superevent_lvalert [
shape=diamond
label="Is this a new type\nsuperevent LVAlert?"
]
perform_raven_search [
label="Perform Raven\ncoincidence search"
]
}
SNEWS_External_Trigger_or_Superevent_LVAlert -> is_new_exttrig_lvalert [
lhead = cluster_snews_lvalert_handle
]
is_new_exttrig_lvalert -> perform_raven_search[label="yes"]
is_new_exttrig_lvalert -> is_new_superevent_lvalert[label="no"]
is_new_superevent_lvalert -> perform_raven_search[label="yes"]
is_new_superevent_lvalert -> ignore[label="no"]
}
Tasks
gwcelery.tasks.external_triggers. REQUIRED_LABELS_BY_TASK = {'combine': {'EXT_SKYMAP_READY', 'RAVEN_ALERT', 'SKYMAP_READY'}, 'compare': {'EM_COINC', 'EXT_SKYMAP_READY', 'SKYMAP_READY'}}
These labels should be present on an external event to consider it to
be ready for sky map comparison.
gwcelery.tasks.external_triggers. FERMI_GRB_CLASS_VALUE = 4
This is the index that denote GRBs within Fermi’s Flight Position
classification.
gwcelery.tasks.external_triggers. FERMI_GRB_CLASS_THRESH = 50
This values denotes the threshold of the most likely Fermi source
classification, above which we will consider a Fermi Flight Position
notice.
(task) gwcelery.tasks.external_triggers. handle_snews_gcn ( payload ) [source]
Handles the payload from SNEWS alerts.
Prepares the alert to be sent to graceDB as ‘E’ events.
(task) gwcelery.tasks.external_triggers. handle_grb_gcn ( payload ) [source]
Handles the payload from Fermi, Swift, INTEGRAL, and AGILE MCAL
GCN notices.
Filters out candidates likely to be noise. Creates external events
from the notice if new notice, otherwise updates existing event. Then
creates and/or grabs external sky map to be uploaded to the external event.
(task) gwcelery.tasks.external_triggers. handle_grb_lvalert ( alert ) [source]
Parse an LVAlert message related to superevents/GRB external triggers
and dispatch it to other tasks.
Notes
This LVAlert message handler is triggered by creating a new superevent or
GRB external trigger event, or a label associated with completeness of sky
maps:
(task) gwcelery.tasks.external_triggers. handle_snews_lvalert ( alert ) [source]
Parse an LVAlert message related to superevents/SN external triggers and
dispatch it to other tasks.
Notes
This LVAlert message handler is triggered by creating a new superevent or
SN external trigger event: