{
  "submitter": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
  "bibcode": "2025GCN.41865....1F",
  "circularId": 41865,
  "submittedHow": "email",
  "body": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 12:32:18 UT on 18 Sep 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250918A (trigger 779891543.0931 / 250918522).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 221.8, Dec = -15.9 (J2000 degrees, equivalent to J2000 14h 47m, -15d 54'), with a statistical uncertainty of 3.4 degrees.\n\nThe angle from the Fermi LAT boresight is 93.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250918522/quicklook/glg_skymap_all_bn250918522.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/bn250918522/quicklook/glg_healpix_all_bn250918522.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250918522/quicklook/glg_lc_medres34_bn250918522.gif\n",
  "createdOn": 1758199377666,
  "subject": "GRB 250918A: Fermi GBM Final Real-time Localization",
  "eventId": "GRB 250918A"
}