{
  "circularId": 44425,
  "createdOn": 1777505678388,
  "submitter": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
  "bibcode": "2026GCN.44425....1F",
  "submittedHow": "email",
  "body": "The Fermi GBM team reports the detection of a likely SHORT GRB\n\nAt 23:24:02 UT on 29 Apr 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260429A (trigger 799197847.01658 / 260429975).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 283.9, Dec = 18.1 (J2000 degrees, equivalent to J2000 18h 55m, 18d 06'), with a statistical uncertainty of 2.6 degrees.\n\nThe angle from the Fermi LAT boresight is 76.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260429975/quicklook/glg_skymap_all_bn260429975.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/bn260429975/quicklook/glg_healpix_all_bn260429975.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260429975/quicklook/glg_lc_medres34_bn260429975.gif\n",
  "eventId": "GRB 260429A",
  "subject": "GRB 260429A: Fermi GBM Final Real-time Localization"
}