{
  "bibcode": "2012GCN.13339....1G",
  "body": "David Gruber (MPE) reports on behalf of the Fermi GBM Team:\n\n\"At 09:07:52.39 UT on 21 May 2012, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 120521B (trigger 359284074 / 120521380).\nwhich was also detected by the Swift/BAT\n(Krimm et al. 2012, GCN 13317)\nThe GBM on-ground location is consistent with the Swift position.\n\nThe angle from the Fermi LAT boresight is 84 degrees.\n\nThe GBM light curve consists of a single pulse\nwith a duration (T90) of about 91 s (50-300 keV).\nThe time-averaged spectrum from T0-5 s to T0+29 s is\nbest fit by a power law function with an exponential\nhigh-energy cutoff.  The power law index is -0.34 +/- 0.20 and\nthe cutoff energy, parameterized as Epeak, is 213 +/- 29 keV\n\nThe event fluence (10-1000 keV) over the T90 time interval is\n(3.11 +/- 0.07)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+2.4 s in the 10-1000 keV band\nis 1.55 +/- 0.23 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 13339,
  "createdOn": 1337764618000,
  "email": "dgruber@mpe.mpg.de",
  "subject": "GRB 120521B: Fermi GBM observation",
  "submitter": "David Gruber at MPE  <dgruber@mpe.mpg.de>",
  "eventId": "GRB 120521B"
}