{
  "circularId": 40050,
  "body": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 14:19:46 UT on 4 Apr 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250404A (trigger 765469191.347644 / 250404597).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 123.4, Dec = 34.1 (J2000 degrees, equivalent to J2000 08h 13m, 34d 06'), with a statistical uncertainty of 1.2 degrees.\n\nThe angle from the Fermi LAT boresight is 42.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250404597/quicklook/glg_skymap_all_bn250404597.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/bn250404597/quicklook/glg_healpix_all_bn250404597.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250404597/quicklook/glg_lc_medres34_bn250404597.gif\n",
  "createdOn": 1743777025336,
  "submitter": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
  "bibcode": "2025GCN.40050....1F",
  "subject": "GRB 250404A: Fermi GBM Final Real-time Localization",
  "eventId": "GRB 250404A",
  "submittedHow": "email"
}