{
  "bibcode": "2009GCN..9556....1R",
  "body": "Arne Rau (MPE) reports on behalf of the Fermi GBM Team:\n\n\"At 04:26:34.49  UT on 21 June 2009, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 090621 (trigger 267251196  / 090621185) which was\nalso detected by the Swift/BAT (Curan et al. 2009, GCN 9540). The GBM\ntriggered on the second BAT trigger (355304) and at approx. 4 min after the\ninitial BAT trigger (355303) for this event. The GBM on-ground location is\nconsistent with the Swift position.\n \nThe angle from the Fermi LAT boresight is 12 degrees.\n\nThe GBM light curve shows a faint peak coinciding with the initial Swift\ntrigger (355303) and two brighter peaks starting at the GBM trigger time.\nThe burst duration (T90) including the first faint peak is about 294 s\n(8-1000 keV).\n\nThe time-averaged spectrum of the two brighter peaks starting from the GBM\ntrigger time T0-6.10 s to T0+45.06 s is best fit by a Band function with\nEpeak = 56.0 +/- 10.7 keV, alpha = -1.1 +/- 0.2, and beta = -2.12 +/- 0.09\n(chi squared 377 for 366 d.o.f.).\n\nThe event fluence (8-1000 keV) in the above time interval is\n(4.4 +/- 1.0)E-06 erg/cm^2. The 1.024-sec peak photon flux measured\nstarting from T0+35.840 s in the 8-1000 keV band is  1.92 +/- 0.06 \nph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 9556,
  "createdOn": 1245691690000,
  "email": "arau@mpe.mpg.de",
  "subject": "GRB 090621: Fermi GBM observation",
  "submitter": "Arne Rau at MPE  <arau@mpe.mpg.de>",
  "eventId": "GRB 090621"
}