{
  "bibcode": "2020GCN.28362....1L",
  "body": "S. Lesage (UAH) and C. Meegan (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 00:44:19.25 UT on 3 September 2020, the Fermi Gamma-Ray Burst Monitor\n(GBM)\ntriggered and located GRB 200903A (trigger 620786664 / 200903031)\nwhich was also detected by the Swift/BAT (A. P. Beardmore et al. 2020, GCN\n28350).\nThe Fermi GBM Final Real-time Localization (GCN 28349) is consistent with\nthe Swift position.\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is ~61\ndegrees.\n\nThe GBM light curve shows a single bright peak\nwith a duration (T90) of about 26.9 s (50-300 keV).\nThe time-averaged spectrum from T0-5.4 s to T0+21.5 s is\nbest fit by a power law function with an exponential\nhigh-energy cutoff.  The power law index is -0.9 +/- 0.1 and\nthe cutoff energy, parameterized as Epeak, is 111.4 +/- 8.9 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(4.6 +/- 0.2)E-06 erg/cm^2. The 1.024-sec peak photon flux measured\nstarting from T0+3.3 s in the 10-1000 keV band\nis 6.03 +/- 0.24 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": 28362,
  "createdOn": 1599180495000,
  "email": "sjl0014@uah.edu",
  "subject": "GRB 200903A: Fermi GBM detection",
  "submitter": "Stephen Lesage at Fermi-GBM Team  <sjl0014@uah.edu>",
  "eventId": "GRB 200903A"
}