{
  "createdOn": 1757385839902,
  "bibcode": "2025GCN.41753....1F",
  "subject": "GRB 250909A: Fermi GBM Final Real-time Localization",
  "eventId": "GRB 250909A",
  "submittedHow": "email",
  "circularId": 41753,
  "body": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 02:33:28 UT on 9 Sep 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250909A (trigger 779078013.882702 / 250909107).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 78.8, Dec = 39.5 (J2000 degrees, equivalent to J2000 05h 15m, 39d 30'), with a statistical uncertainty of 3.3 degrees.\n\nThe angle from the Fermi LAT boresight is 85.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250909107/quicklook/glg_skymap_all_bn250909107.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/bn250909107/quicklook/glg_healpix_all_bn250909107.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250909107/quicklook/glg_lc_medres34_bn250909107.gif\n",
  "submitter": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>"
}