{
  "submitter": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
  "body": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 15:15:22 UT on 3 Apr 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250403A (trigger 765386127.830438 / 250403636).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 204.2, Dec = -25.4 (J2000 degrees, equivalent to J2000 13h 36m, -25d 23'), with a statistical uncertainty of 5.1 degrees.\n\nThe angle from the Fermi LAT boresight is 56.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250403636/quicklook/glg_skymap_all_bn250403636.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/bn250403636/quicklook/glg_healpix_all_bn250403636.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250403636/quicklook/glg_lc_medres34_bn250403636.gif\n",
  "subject": "GRB 250403A: Fermi GBM Final Real-time Localization",
  "eventId": "GRB 250403A",
  "submittedHow": "email",
  "circularId": 40025,
  "createdOn": 1743693966281,
  "bibcode": "2025GCN.40025....1F"
}