{
  "bibcode": "2021GCN.30099....1V",
  "body": "P. Veres and C. Meegan (both UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 14:03:46.16 UT on 28 May 2021, the Fermi Gamma-Ray Burst Monitor\n(GBM) triggered and located GRB 210528A (trigger 643903431 /\n210528586).\n\nThe on-ground calculated location, using the GBM trigger data, is\nreported in GCN #30090.\n\nThe GBM light curve consists of a strong pulse with some overlapping\nstructure and a duration (T90) of about 1 s (50-300 keV). The\ntime-averaged spectrum from T0-0.3 s to T0+1.3 s is\nbest fit by a power law function with an exponential high-energy\ncutoff.  The power law index is -0.47 +/- 0.06 and the cutoff energy,\nparameterized as Epeak, is 210 +/- 9 keV.\n\nThe event fluence (10-1000 keV) in this time interval is (3.90 +/-\n0.12)E-6 erg/cm^2. The 64ms peak photon flux measured starting from T0\n+ 0.256 s in the 10-1000 keV band is 31.7 +/- 2.0 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": 30099,
  "createdOn": 1622302480000,
  "email": "veresp@gmail.com",
  "subject": "GRB 210528A: Fermi GBM detection",
  "submitter": "Peter Veres at UAH  <veresp@gmail.com>",
  "eventId": "GRB 210528A"
}