{
  "editedOn": 1773767466327,
  "circularId": 44031,
  "submitter": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov>",
  "eventId": "GRB 260316B",
  "format": "text/plain",
  "subject": "GRB 260316B: Fermi GBM Final Real-time Localization",
  "body": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 17:12:52 UT on 16 Mar 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260316B (trigger 795373977.681026 / 260316717).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 305.5, Dec = -79.3 (J2000 degrees, equivalent to J2000 20h 22m, -79d 17'), with a statistical uncertainty of 3.2 degrees.\n\nThe angle from the Fermi LAT boresight is 81.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260316717/quicklook/glg_skymap_all_bn260316717.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/2026/bn260316717/quicklook/glg_healpix_all_bn260316717.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260316717/quicklook/glg_lc_medres34_bn260316717.gif\n",
  "version": 2,
  "submittedHow": "email",
  "createdOn": 1773681806005,
  "bibcode": "2026GCN.44031....1F"
}