{
  "submitter": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
  "submittedHow": "email",
  "createdOn": 1776760558188,
  "body": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 08:25:19 UT on 21 Apr 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260421C (trigger 798452724.59066 / 260421351).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 295.0, Dec = 64.2 (J2000 degrees, equivalent to J2000 19h 40m, 64d 12'), with a statistical uncertainty of 3.1 degrees.\n\nThe angle from the Fermi LAT boresight is 59.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260421351/quicklook/glg_skymap_all_bn260421351.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/bn260421351/quicklook/glg_healpix_all_bn260421351.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260421351/quicklook/glg_lc_medres34_bn260421351.gif\n",
  "subject": "GRB 260421C: Fermi GBM Final Real-time Localization",
  "eventId": "GRB 260421C",
  "circularId": 44369
}