{
  "subject": "GRB 260727B: Fermi GBM Final Real-time Localization",
  "submitter": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
  "circularId": 45222,
  "createdOn": 1785122882092,
  "body": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 03:17:30 UT on 27 Jul 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260727B (trigger 806815055.083858 / 260727137).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 191.4, Dec = -24.5 (J2000 degrees, equivalent to J2000 12h 45m, -24d 30'), with a statistical uncertainty of 10.6 degrees.\n\nThe angle from the Fermi LAT boresight is 80.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260727137/quicklook/glg_skymap_all_bn260727137.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/bn260727137/quicklook/glg_healpix_all_bn260727137.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260727137/quicklook/glg_lc_medres34_bn260727137.gif\n",
  "eventId": "GRB 260727B",
  "submittedHow": "email",
  "bibcode": "2026GCN.45222....1F"
}