{
  "bibcode": "2013GCN.14435....1R",
  "body": "Arne Rau (MPE) reports on behalf of the Fermi GBM Team:\n\n\"At 12:56:32.99 UT on 20 April 2013, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 130420B (trigger 388155395 / 130420539),\nwhich was also detected by Swift/BAT (Oates et al., GCN 14411).\nThe GBM on-ground location is consistent with the Swift position.\nThe angle from the Fermi LAT boresight is about 50 degrees.\n\nThe GBM light curve shows a single pulse with a duration (T90) of\nabout 16 s (50-300 keV). The time-averaged spectrum from T0-4 s\nto T0+4 s is best fit by a power law function with an exponential\nhigh-energy cutoff. The power law index is 0.24 +/- 0.25 and\nthe cutoff energy, parameterized as Epeak, is 91 +/- 9 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.04 +/- 0.08)E-07 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+0.0 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.\"",
  "circularId": 14435,
  "createdOn": 1366630153000,
  "email": "arau@mpe.mpg.de",
  "subject": "GRB 130420B: Fermi GBM observation",
  "submitter": "Arne Rau at MPE  <arau@mpe.mpg.de>",
  "eventId": "GRB 130420B"
}