{
  "bibcode": "2009GCN..9558....1R",
  "body": "Arne Rau (MPE) reports on behalf of the Fermi GBM Team:\n\n\"At 10:00:52.10 UT on 21 June 2009, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 090621C (trigger 267271254 / 090621417).\n\nThe on-ground calculated location, using the GBM trigger\ndata, is RA = 257.5 deg, DEC = -28.5 deg (J2000 degrees,\nequivalent to 17 h 10 m, -28 d 28 '), with an uncertainty\nof 3.3 degrees (radius, 1-sigma containment,\nstatistical only; there is additionally a systematic\nerror which is currently estimated to be 2 to 3 degrees).\n\nThe angle from the Fermi LAT boresight is 52 degrees.\n\nThe GBM light curve consists of multiple short peaks\nwith a duration (T90) of about 59.9 s (8-1000 keV).\nThe time-averaged spectrum from T0-3.072 s to T0+28.672 s is\nwell fit by a power law function with an exponential\nhigh energy cutoff.  The power law index is -1.4 +/- 0.1 and\nthe cutoff energy, parameterized as Epeak, is 148 +/- 34 keV\n(chi squared 444 for 461 d.o.f.).\n\nThe event fluence (8-1000 keV) in the above mentioned time interval is\n(1.8 +/- 0.2)E-06 erg/cm^2. The 1.024-sec peak photon flux measured\nstarting from T0+4.096 s in the 8-1000 keV band\nis 2.29 +/- 0.06 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 9558,
  "createdOn": 1245699735000,
  "email": "arau@mpe.mpg.de",
  "subject": "GRB 090621C: Fermi GBM detection",
  "submitter": "Arne Rau at MPE  <arau@mpe.mpg.de>",
  "eventId": "GRB 090621C"
}