MAXI/GSC Known Source Position

MAXI/GSC known-source detection notice.

View the source on GitHub

Properties

* = required

Name	Type	Description
$schema	string
flux	number	Representative X-ray flux of the source in the most significant energy band specified by flux_spectral_band and flux_spectral_unit [erg/cm^2/s].
flux_error	number	1-sigma statistical uncertainty on flux [erg/cm^2/s].
detection_timescale	number	Detection time scale of the source; unit specified by detection_timescale_units.
detection_timescale_units	string	Unit of detection_timescale: s (seconds), scan (one camera scan), orbit (one ISS orbit), or d (days). Options: s, scan, orbit, d
band_flux_low	array	Two-element array [flux, 1-sigma statistical uncertainty] for the 2-4 keV band [erg/cm^2/s].
band_flux_med	array	Two-element array [flux, 1-sigma statistical uncertainty] for the 4-10 keV band [erg/cm^2/s].
band_flux_high	array	Two-element array [flux, 1-sigma statistical uncertainty] for the 10-20 keV band [erg/cm^2/s].

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
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)
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)
AdditionalInfo.schema.json		core schema object (click to expand)
Spectral.schema.json		core schema object (click to expand)

Example

{
  "$schema": "https://gcn.nasa.gov/schema/v7.2.1/gcn/notices/maxi/gsc.known.schema.json",
  "mission": "MAXI",
  "instrument": "GSC",
  "alert_datetime": "2025-07-03T03:38:48Z",
  "alert_type": "initial",
  "alert_tense": "current",
  "trigger_time": "2025-07-02T14:35:59Z",
  "id": "0858800020",
  "ra": 285.6,
  "dec": -9.2,
  "flux": 2e-10,
  "flux_error": 1.77e-10,
  "detection_timescale": 1,
  "detection_timescale_units": "s",
  "flux_spectral_band": [
    4,
    10
  ],
  "flux_spectral_unit": "keV",
  "event_name": "Swift J1858.6-0814",
  "band_flux_low": [
    4.17e-10,
    1.3e-10
  ],
  "band_flux_med": [
    2e-10,
    1.77e-10
  ],
  "band_flux_high": [
    6.77e-10,
    2.23e-10
  ],
  "latitude": 0,
  "longitude": 0,
  "record_number": 1
}