{
  "subject": "GRB 250312B: Fermi GBM Final Localization",
  "eventId": "GRB 250312B",
  "createdOn": 1741816501620,
  "submittedHow": "web",
  "bibcode": "2025GCN.39692....1F",
  "format": "text/plain",
  "body": "The Fermi GBM team reports the detection of a likely LONG GRB\n\n\"At 20:36:56.64 UT on 12 March 2025, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 250312B (trigger 763504621/250312859).\n\nThe on-ground calculated location, using the Fermi GBM trigger data,\nis RA = 180.86, Dec = -50.96 (J2000 degrees, equivalent to J2000 12h 3m, -50d 57'),\nwith a statistical uncertainty of 4.87 degrees.\n\nThe angle from the Fermi LAT boresight is 105 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250312859/quicklook/glg_skymap_all_bn250312859.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/bn250312859/quicklook/glg_healpix_all_bn250312859.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250312859/quicklook/glg_lc_medres34_bn250312859.gif\"",
  "submitter": "Lorenzo Scotton at UAH <lscottongcn@outlook.com>",
  "circularId": 39692
}