gcnnoticesfermigbmtrigger

Fermi GBM Alert

This schema is for the following Fermi GBM notices: alert, flight position, ground position, final position and subthreshold.

View the source on GitHub

Properties

* = required

Name	Type	Description
$schema	string
detectors_status	array	Triggered detectors
duration_class	enum	This is a preliminary classification of the GRB of LONG (> 2.048) or SHORT (<= 2.048 s). It is reevaluated using the T_90 bmeasurement, when it ecomes available. Note that a preliminary classification of LONG is confirmed by the T_90 classification for 95% of the bursts and SHORT - for 92%. Options: SHORT, LONG
earth_angle	number	Angle between the event and the Earth's center [deg]
galactic_b	number	Galactic latitude [deg]
galactic_l	number	Galactic longitude [deg]
ground_generated_notice	boolean	If true, the notice is ground generated. If false, the notice is flight generated.
hardness_class	enum	Classification based on the hardness ratio. Options: SOFT, HARD
high_energy_high_intensity	boolean	True, if `A * RATE > 1`, where `RATE` is the background-subtracted rate (in counts per second) in the energy range 0.4 – 20 MeV in the brighter BGO detectors and `A` is a factor depending on the `rate_duration` (in seconds) as follows: {0.016: 1, 0.032: 2, 0.064: 2, 0.128: 2, 0.256: 4, 0.512: 4, 1.024: 4, 2.048: 6, 4.096: 8.8, 8.192: 8.8}. False, if neither BGO detector satisfies the condition.
human_in_the_loop	boolean	True when a human had input or confirmed before further processing. False when the notice was generated entirely automatically.
in_lat_fov	boolean	The event was localized in the LAT field of view, 60 degrees from the LAT boresight.
light_curve_url	string	URL of the quicklook light curve plot
localization_algorithm	string	Version number of the algorithm
localization_energy_range	array	The energy range in keV used for localization, which is distinct from the energy range used by the trigger algorithm.
reliability	enum	Reliability of the subthreshold search result. Options: LOW, MED, HIGH
subtype	enum	Specifies the Fermi GBM notice subtype. The enum corresponds to legacy numeric notice types 110, 111, 112, 115. Options: INITIAL_ALERT, FLIGHT_POSITION, GROUND_POSITION, FINAL_POSITION
sun_distance	number	Event-Sun angle [deg]
trigger_algorithm_number	number	The instrument flight software algorithm that triggered on this event, dependent on timescale, energy, and significance as described in A. von Kienlin et al 2020 ApJ 893 46.

Properties from all of the following:

These properties are inherited using the allOf syntax. In order to validate, all of the following schemas must be individually valid, based on their respective properties. See allOf for more information.

Name		Description
AdditionalInfo.schema.json		core schema object (click to expand)
Alert.schema.json		core schema object (click to expand)
DateTime.schema.json		core schema object (click to expand)
Event.schema.json		core schema object (click to expand)
GeoLocBase.schema.json		core schema object (click to expand)
HardnessRatio.schema.json		core schema object (click to expand)
Localization.schema.json		core schema object (click to expand)
Reporter.schema.json		core schema object (click to expand)
Statistics.schema.json		core schema object (click to expand)
GammaRay.schema.json		spectral schema object (click to expand)

Example

{
  "$schema": "https://gcn.nasa.gov/schema/v6.0.0/gcn/notices/fermi/gbm/trigger.schema.json",
  "additional_info": "The LC_URL file will not be created until ~15 min after the trigger.",
  "alert_datetime": "2024-08-24T02:14:54",
  "alert_tense": "current",
  "alert_type": "initial",
  "data_archive_page": "http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240812094",
  "detectors_status": [
    "triggered",
    "on",
    "triggered",
    "triggered",
    "on",
    "on",
    "triggered",
    "on",
    "on",
    "on",
    "on",
    "on",
    "on",
    "on"
  ],
  "ground_generated_notice": false,
  "human_in_the_loop": false,
  "id": [
    "745121685",
    "bn240812094"
  ],
  "instrument": "GBM",
  "latitude": 23.83,
  "light_curve_url": "http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240812094/quicklook/glg_lc_medres34_bn240812094.gif",
  "longitude": 257.4,
  "messenger": "EM",
  "mission": "Fermi",
  "rate_duration": 2.048,
  "rate_energy_range": [
    47,
    291
  ],
  "rate_snr": 4.9,
  "record_number": 1,
  "spectral_band_units": "keV",
  "subtype": "INITIAL_ALERT",
  "trigger_algorithm_number": 14,
  "trigger_time": "2024-08-24T02:14:40.43",
  "trigger_type": "rate"
}