{
  "submittedHow": "web",
  "createdOn": 1792561007205,
  "body": "M. Dafcikova (MUNI) reports on behalf of the Fermi Gamma-ray Burst Monitor Team:\n\n\"At 05:37:08.94 UT on 20 October 2026, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 261020A (trigger 814167433/261020234),\nwhich was also detected by MAXI GSC (T. Kato et al. 2026, GCN 45993).\nThe Fermi GBM on-ground location is consistent with the MAXI position.\n\nThe angle from the Fermi LAT boresight is 89 degrees.\n\nThe GBM light curve consists of an emission episode with a duration (T90)\nof about 114 s (50-300 keV). The time-averaged spectrum\nfrom T0-22 to T0+98 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -0.76 +/- 0.06 and the cutoff energy,\nparameterized as Epeak, is 1000 +/- 70 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.47 +/- 0.06)E-05 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+3.6 s in the 10-1000 keV band is 3.1 +/- 0.3 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog:\nhttps://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html\n\nFor Fermi GBM data and info, please visit the official Fermi GBM Support Page:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"",
  "eventId": "GRB 261020A",
  "eventType": [
    "GRB",
    "Gamma-ray Transient"
  ],
  "format": "text/plain",
  "circularId": 46002,
  "submitter": "Marianna Dafčíková at Masaryk University <500025@mail.muni.cz>",
  "subject": "GRB 261020A: Fermi GBM Observation"
}