{
  "bibcode": "2009GCN..9929....1R",
  "body": "Arne Rau (MPE) reports on behalf of the Fermi GBM Team:\n\n\"At 12:56:42.14  UT on 22 September 2009, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 090922A (trigger 275317004  / 090922539).\n\nThe on-ground calculated location, using the GBM trigger\ndata, is RA = 17.1, DEC = 74.3 (J2000 degrees,\nequivalent to 17h 06m, 74d 18'), with an uncertainty\nof 1 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 19 degrees.\nMoreover, this burst was bright enough to result in\na Fermi spacecraft re-pointing maneuver.\n\nThe GBM light curve shows a bright peak of approximately 10s duration\nfollowed by a weaker pulse approx. 60s later. The burst duration (T90) \nis 92 +/ 3 s (8-1000 keV).\nThe time-averaged spectrum of the main peak from T+0.003 s to T0+10.240 \ns is\nbest fit by a Band function with Epeak = 139.3 +/- 6.6 keV,\nalpha = -0.77 +/- 0.05, and beta = -2.28 +/- 0.07 (chi squared 1217/921 \nd.o.f.).\n\nThe event fluence (8-1000 keV) in this time interval is\n(1.14 +/- 0.02)E-05 erg/cm^2. The 1.024-sec peak photon flux measured\nstarting from T0+2.048 s in the 8-1000 keV band\nis 15.6 +/- 0.04 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 9929,
  "createdOn": 1253690812000,
  "email": "arau@mpe.mpg.de",
  "subject": "GRB 090922A: Fermi GBM detection",
  "submitter": "Arne Rau at MPE  <arau@mpe.mpg.de>",
  "eventId": "GRB 090922A"
}