{
  "bibcode": "2021GCN.29709....1H",
  "body": "R. Hamburg (UAH) and C. Meegan (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 22:02:18.40 UT on 23 March 2021, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 210323A (trigger 638229743 / 210323918),\nwhich was also detected by the Swift/BAT and Swift/XRT (Gropp et al. 2021,\nGCN 29699). The GBM on-ground location is consistent with the Swift\nposition.\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 92\ndegrees.\n\nThe GBM light curve shows a single-peaked structure\nwith a duration (T90) of about 1 s (50-300 keV).\nThe time-averaged spectrum from T0-0.064 s to T0+0.192 s is\nbest fit by a power law function with an exponential\nhigh-energy cutoff. The power law index is -0.97 +/- 0.05 and\nthe cutoff energy, parameterized as Epeak, is 2.1 +/- 0.4 MeV.\nA Band function also fits the spectrum with Epeak = 2.1 +/- 0.5 MeV,\nalpha = -0.97 +/- 0.05 and beta = -3.02 +/- 1.02.\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.2 +/- 0.1)E-06 erg/cm^2. The 64-ms peak photon flux measured\nstarting from T0+0.064 s in the 10-1000 keV band\nis 21.3 +/- 1.5 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\nPage:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"",
  "circularId": 29709,
  "createdOn": 1616592647000,
  "email": "rkh0007@uah.edu",
  "subject": "GRB 210323A: Fermi GBM detection",
  "submitter": "Rachel Hamburg at UAH  <rkh0007@uah.edu>",
  "eventId": "GRB 210323A"
}