{
  "eventId": "GRB 251026B",
  "bibcode": "2025GCN.42513....1D",
  "body": "M. Dafcikova (MUNI) reports on behalf of the Fermi Gamma-ray Burst Monitor Team:\n\n\"At 07:18:53.33 UT on 26 October 2025, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 251026B (trigger 783155938/251026305).\n\nThe angle from the Fermi LAT boresight is 19 degrees.\n\nThe GBM light curve consists of a single emission episode with a duration (T90)\nof about 6 s (50-300 keV). The time-averaged spectrum\nfrom T0-1.3 to T0+3.7 s is best fit by\na simple power law function with index -1.38 +/- 0.04.\n\nThe event fluence (10-1000 keV) in this time interval is\n(7.2 +/- 0.7)E-07 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0-0.32 s in the 10-1000 keV band is 1.6 +/- 0.2 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/\"",
  "circularId": 42513,
  "subject": "GRB 251026B: Fermi GBM Observation",
  "format": "text/plain",
  "submittedHow": "web",
  "createdOn": 1761748822344,
  "submitter": "Marianna Dafčíková at Masaryk University <500025@mail.muni.cz>"
}