{
  "submitter": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
  "circularId": 44358,
  "createdOn": 1776738198620,
  "body": "The Fermi GBM team reports the detection of a likely SHORT GRB\n\nAt 02:12:44 UT on 21 Apr 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260421A (trigger 798430369.324586 / 260421092).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 198.8, Dec = 62.9 (J2000 degrees, equivalent to J2000 13h 15m, 62d 53'), with a statistical uncertainty of 8.2 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/bn260421092/quicklook/glg_skymap_all_bn260421092.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/bn260421092/quicklook/glg_healpix_all_bn260421092.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260421092/quicklook/glg_lc_medres34_bn260421092.gif\n",
  "subject": "GRB 260421A: Fermi GBM Final Real-time Localization",
  "eventId": "GRB 260421A",
  "submittedHow": "email"
}