{
  "bibcode": "2022GCN.32829....1B",
  "body": "E. Bissaldi (Politecnico and INFN Bari) and\nC. Meegan (UAH) report on behalf of the Fermi GBM Team:\n\n\n\"At 09:18:25.74 UT on 21 October 2022,\nthe Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 221021A\n(trigger 688036710 / 221021388),\nwhich was also detected by the Swift/BAT-GUANO\n(Raman et al. 2022, GCN 32817).\n\nThe GBM position is reported in the Fermi-GBM\nFinal Real-time Localization (GCN 32812).\nThe angle from the Fermi LAT boresight\nat the GBM trigger time is 132 degrees.\n\nThe GBM light curve shows a multipeaked emission\nwith a duration (T90) of about 68 s (50-300 keV).\nThe time-averaged spectrum from T0 to T0+60 s is\nbest fit by a power law function with an exponential\nhigh-energy cutoff.\nThe power law index is -1.16 +/- 0.03 and the cutoff\nenergy, parameterized as Epeak, is 2000 +/- 210 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(3.06 +/- 0.07)E-05 erg/cm^2.\nThe 1-sec peak photon flux measured\nstarting from T0+34 s in the 10-1000 keV band\nis 9.1 +/- 0.5 ph/s/cm^2.\n\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": 32829,
  "createdOn": 1666631341000,
  "email": "elisabetta.bissaldi@ba.infn.it",
  "subject": "GRB 221021A: Fermi GBM observation",
  "submitter": "Elisabetta Bissaldi at INFN,Bari  <elisabetta.bissaldi@ba.infn.it>",
  "eventId": "GRB 221021A"
}