{
  "circularId": 41420,
  "bibcode": "2025GCN.41420....1F",
  "subject": "GRB 250818C: Fermi GBM Final Real-time Localization",
  "eventId": "GRB 250818C",
  "createdOn": 1755559614775,
  "body": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 23:16:23 UT on 18 Aug 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250818C (trigger 777251788.512804 / 250818970).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 203.8, Dec = 74.7 (J2000 degrees, equivalent to J2000 13h 35m, 74d 42'), with a statistical uncertainty of 1.0 degrees.\n\nThe angle from the Fermi LAT boresight is 0.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250818970/quicklook/glg_skymap_all_bn250818970.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/bn250818970/quicklook/glg_healpix_all_bn250818970.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250818970/quicklook/glg_lc_medres34_bn250818970.gif\n",
  "submittedHow": "email",
  "submitter": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>"
}