{
  "circularId": 44195,
  "subject": "GRB 260403A: Fermi GBM Final Real-time Localization",
  "createdOn": 1775184118495,
  "submitter": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
  "eventId": "GRB 260403A",
  "submittedHow": "email",
  "body": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 02:31:27 UT on 3 Apr 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260403A (trigger 796876292.704364 / 260403105).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 236.2, Dec = -31.0 (J2000 degrees, equivalent to J2000 15h 44m, -31d 00'), with a statistical uncertainty of 5.0 degrees.\n\nThe angle from the Fermi LAT boresight is 86.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260403105/quicklook/glg_skymap_all_bn260403105.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/bn260403105/quicklook/glg_healpix_all_bn260403105.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260403105/quicklook/glg_lc_medres34_bn260403105.gif\n"
}