{
  "bibcode": "2022GCN.31988....1R",
  "body": "O.J. Roberts (USRA) and C. Meegan (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 19:51:50.74 UT on 01 May 2022, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 220501A (trigger 673127515 / 220501828), which\nwas also detected by Swift/BAT (A. D'Ai et al. 2022, GCN 31982). The\nFermi GBM Final Real-time Localization (GCN 31983) is consistent with the\nSwift position.\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 94 degrees.\n\nThe GBM light curve shows a FRED-like burst\nwith a duration (T90) of about 51 s (50-300 keV).\nThe time-averaged spectrum from T0-3.6 s to T0+47.6 s is\nbest fit by a power law function with an exponential\nhigh-energy cutoff. The power law index is -0.49 +/- 0.18 and\nthe cutoff energy, parameterized as Epeak, is 114 +/- 11 keV\n\nThe event fluence (10-1000 keV) in this time interval is\n(3.53 +/- 0.24)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+2.0 s in the 10-1000 keV band\nis 2.5 +/- 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": 31988,
  "createdOn": 1651499618000,
  "email": "oliver.roberts@nasa.gov",
  "subject": "GRB 220501A: Fermi GBM observation",
  "submitter": "Oliver J Roberts at USRA/NASA  <oliver.roberts@nasa.gov>",
  "eventId": "GRB 220501A"
}