{
  "bibcode": "2009GCN..9904....1C",
  "body": "V.Chaplin (UAH) reports on behalf of the Fermi GBM Team:\n\n\"At 19:29:48.81 UT on 10 SEP 2009, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 090910 (trigger 274303790 / 090910812).\n\nThe on-ground calculated location, using the GBM trigger\ndata, is RA = 296.2, DEC = 72.3 (J2000 degrees,\nequivalent to 19h 44m, 72 d 18'), with an uncertainty\nof 1.0 degrees (radius, 1-sigma containment,\nstatistical only; there is additionally a systematic\nerror which is currently estimated to be 2 to 3 degrees).\nThe angle from the Fermi LAT boresight is 107 degrees.\n\nThe on-board GBM Flight Software localization for this event,\nas reported in the GCN notice, was consistent with a position\nnear the Earth's limb.  Furthermore, the trigger occurred as\nthe spacecraft was at a high magnetic latitude.  The resulting\nautonomous classification for the event was \"Distant Particles\",\nwhich is erroneous.\n\nThe GBM light curve consists of three distinct pulses\nclose in time from T0-5s to about T0+45s, with a smaller pulse\nvisible in several detectors at about T0+70s.  The duration (T90)\nof this event is approximately 62s (8-1000 keV).\nThe time-averaged spectrum from T0-7.2 s to T0+44 s is\nbest fit by a Band function with Epeak = 274.8 +/- 56.1 keV,\nalpha = -0.9 +/- 0.1, and beta = -2.0 +/- 0.2 (chi squared 397.41\nfor 360 d.o.f.).\n\nThe event fluence (8-1000 keV) in this time interval is\n(9.2 +/- 0.7)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+2 s in the 8-1000 keV band\nis 2.3 +/- 0.6 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 9904,
  "createdOn": 1252697566000,
  "email": "chapliv@email.uah.edu",
  "subject": "GRB 090910: Fermi GBM detection",
  "submitter": "Vandiver Chaplin at UAH/Fermi-GBM  <chapliv@email.uah.edu>",
  "eventId": "GRB 090910"
}