{
  "bibcode": "2022GCN.31710....1H",
  "body": "Boyan A. Hristov (UAH) and C. Meegan (UAH) report on behalf of\nthe Fermi GBM Team:\n\n\"At 05:28:58.79 UT on 04 March 2022, the Fermi Gamma-Ray Burst\nMonitor (GBM) triggered and located GRB 220304A (trigger\n668064543 / 220304228, GCN 31672), which was also detected by\nthe Swift/BAT-GUANO (DeLaunay et al. 2022, GCN 31677).\n\nThe GBM light curve consists of a single spike with a duration\n(T90) of about 32 s (50-300 keV).  The time-averaged spectrum\nfrom T0+3.072 s to T0+35.841 s is best fit by a Band function\nwith Epeak = 90 +/- 2 keV, alpha = -0.24 +/- 0.06, and beta =\n-3.2 +/- 0.1.  The event fluence (10-1000 keV) in this time\ninterval is (59 +/- 0.7)E-6 erg/cm^2.  The 1-sec peak photon\nflux measured starting from T0+15.488 s in the 10-1000 keV band\nis 36 +/- 1 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\nGBM Support Page:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"",
  "circularId": 31710,
  "createdOn": 1646755899000,
  "email": "bah0046@uah.edu",
  "subject": "GRB 220304A Fermi GBM detection",
  "submitter": "Boyan A. Hristov at UAH  <bah0046@uah.edu>",
  "eventId": "GRB 220304A"
}