{
  "eventId": "GRB 251016B",
  "body": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 23:59:00 UT on 16 Oct 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251016B (trigger 782351945.722452 / 251016999).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 183.6, Dec = 59.6 (J2000 degrees, equivalent to J2000 12h 14m, 59d 36'), with a statistical uncertainty of 1.0 degrees.\n\nThe angle from the Fermi LAT boresight is 46.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251016999/quicklook/glg_skymap_all_bn251016999.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/bn251016999/quicklook/glg_healpix_all_bn251016999.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251016999/quicklook/glg_lc_medres34_bn251016999.gif\n",
  "circularId": 42316,
  "subject": "GRB 251016B: Fermi GBM Final Real-time Localization",
  "submittedHow": "email",
  "createdOn": 1760659830515,
  "bibcode": "2025GCN.42316....1F",
  "submitter": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>"
}