{
  "bibcode": "2009GCN..9865....1B",
  "body": "E. Bissaldi and A. von Kienlin (MPE)\nreport on behalf of the Fermi GBM Team: \n\n\n\"At 09:38:05.49 UT on 2 September 2009, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 090902 (trigger 273577087 / 090902401).\nThe on-ground calculated location, using the GBM trigger\ndata, is RA = 291.0, DEC = 53.1 (J2000 degrees,\nequivalent to 19h 24m, 53d 06'), with an uncertainty\nof 3.8 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 82 degrees.\n\nThis burst was also independently detected by INTEGRAL SPI-ACS.\n\nThe GBM light curve consists of a single peak\nwith a duration (T90) of about 1.2 s (8-1000 keV).\nThe time-averaged spectrum from T0-0.256 s to T0+0.896 s is\nbest fit by a Band function with Epeak = 388 (+82/-102) keV,\nalpha = 0.30 (+0.5/-0.26), and beta = -2.05 (+0.29/-0.24)\n(chi squared 372 for 356 d.o.f.).\n\nThe event fluence (8-1000 keV) in this time interval is\n(2.11 +/- 0.14)E-06 erg/cm^2. The 64-msec peak photon flux measured\nstarting from T0+608 s in the 8-1000 keV band\nis 11.4 +/- 1.3 ph/s/cm^2.\n\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 9865,
  "createdOn": 1251909847000,
  "email": "ebs@mpe.mpg.de",
  "subject": "GRB 090902: Fermi GBM detection",
  "submitter": "Elisabetta Bissaldi at MPE  <ebs@mpe.mpg.de>",
  "eventId": "GRB 090902"
}