{
  "circularId": 39961,
  "bibcode": "2025GCN.39961....1F",
  "eventId": "GRB 250331D",
  "body": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 05:49:17 UT on 31 Mar 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250331D (trigger 765092962.014718 / 250331243).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 21.1, Dec = 55.7 (J2000 degrees, equivalent to J2000 01h 24m, 55d 42'), with a statistical uncertainty of 13.9 degrees.\n\nThe angle from the Fermi LAT boresight is 12.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250331243/quicklook/glg_skymap_all_bn250331243.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/bn250331243/quicklook/glg_healpix_all_bn250331243.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250331243/quicklook/glg_lc_medres34_bn250331243.gif\n",
  "submitter": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
  "createdOn": 1743400793162,
  "subject": "GRB 250331D: Fermi GBM Final Real-time Localization",
  "submittedHow": "email"
}