{
  "circularId": 44174,
  "submitter": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
  "createdOn": 1775041322404,
  "bibcode": "2026GCN.44174....1F",
  "subject": "GRB 260401A: Fermi GBM Final Real-time Localization",
  "eventId": "GRB 260401A",
  "body": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 10:53:26 UT on 1 Apr 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260401A (trigger 796733611.002678 / 260401454).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 219.5, Dec = -17.4 (J2000 degrees, equivalent to J2000 14h 37m, -17d 23'), with a statistical uncertainty of 1.6 degrees.\n\nThe angle from the Fermi LAT boresight is 60.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260401454/quicklook/glg_skymap_all_bn260401454.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/2026/bn260401454/quicklook/glg_healpix_all_bn260401454.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260401454/quicklook/glg_lc_medres34_bn260401454.gif\n",
  "submittedHow": "email"
}