{
  "bibcode": "2021GCN.30065....1V",
  "body": "P. Veres, B. Hristov and C. Meegan (all UAH) report on behalf of the\nFermi GBM Team:\n\n\"At 19:07:02.00 UT on 20 May 2021, the Fermi Gamma-Ray Burst Monitor\n(GBM) triggered and located GRB 210520A (trigger 643230427 /\n210520797) which was also detected by the Fermi LAT (Di Lalla et al.,\nGCN 30062) and GECAM (Zheng et al GCN 30061). The GBM on-ground\nlocation (reported in GCN 30059) is consistent with the LAT position.\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 21 degrees.\n\nThe GBM light curve consists of a large number of pulses\nwith a duration (T90) of about 56 s (50-300 keV).\nThe time-averaged spectrum from T0-1.3 s to T0+58 s is\nadequately fit by a power law function with an exponential\nhigh-energy cutoff.  The power law index is -1.18 +/- 0.04 and\nthe cutoff energy, parameterized as Epeak, is 4.4 +/- 1.8 MeV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.02 +/- 0.04)E-5 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+0.58 s in the 10-1000 keV band\nis 2.6 +/- 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": 30065,
  "createdOn": 1621600907000,
  "email": "veresp@gmail.com",
  "subject": "GRB 210520A: Fermi GBM detection",
  "submitter": "Peter Veres at UAH  <veresp@gmail.com>",
  "eventId": "GRB 210520A"
}