{
  "subject": "GRB 250309B: Fermi GBM Final Localization",
  "format": "text/plain",
  "submittedHow": "web",
  "submitter": "Padraig McDermott at University College Dublin <padraig.mcdermott@ucdconnect.ie>",
  "bibcode": "2025GCN.39635....1F",
  "body": "The Fermi GBM team reports the detection of a likely LONG GRB\n\n\"At 07:38:30.66 UT on 09 March 2025, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 250309B (trigger 763198715/250309318).\n\nThe on-ground calculated location, using the Fermi GBM trigger data,\nis RA = 210.58, Dec = -10.86 (J2000 degrees, equivalent to J2000 14h 02m, -10d 51'),\nwith a statistical uncertainty of 1.2 degrees.\n\nThe angle from the Fermi LAT boresight is 77 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250309318/quicklook/glg_skymap_all_bn250309318.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/bn250309318/quicklook/glg_healpix_all_bn250309318.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250309318/quicklook/glg_lc_medres34_bn250309318.gif\"",
  "eventId": "GRB 250309B",
  "circularId": 39635,
  "createdOn": 1741535260560
}