{
  "eventId": "GRB 251031A",
  "bibcode": "2025GCN.42525....1F",
  "body": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 07:21:00 UT on 31 Oct 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251031A (trigger 783588065.486224 / 251031306).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 190.3, Dec = -17.6 (J2000 degrees, equivalent to J2000 12h 41m, -17d 36'), with a statistical uncertainty of 3.3 degrees.\n\nThe angle from the Fermi LAT boresight is 49.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251031306/quicklook/glg_skymap_all_bn251031306.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251031306/quicklook/glg_healpix_all_bn251031306.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251031306/quicklook/glg_lc_medres34_bn251031306.gif\n",
  "submitter": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
  "submittedHow": "email",
  "createdOn": 1761895882380,
  "subject": "GRB 251031A: Fermi GBM Final Real-time Localization",
  "circularId": 42525
}