{
  "bibcode": "2009GCN..9866....1B",
  "body": "Elisabetta Bissaldi (MPE) and Valerie Connaughton (UAH)\nreport on behalf of the Fermi GBM Team: \n\n\n\"At 11:05:08.31 UT on 2 September 2009, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 090202B (trigger 273582310 / 090902462).\nThe on-ground calculated location, using the GBM trigger\ndata, is RA = 264.5, DEC = 26.5 (J2000 degrees,\nequivalent to 17h 38m, 26d 30'), with an uncertainty\nof 1.0 degree (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.\nMoreover, this burst was bright enough to result in\na Fermi spacecraft repointing maneuver.\n\nThe burst was also independently detected by INTEGRAL SPI-ACS.\n\nThe GBM light curve consists of a bright pulse\nwith a duration of about 21 s.\nThe time-averaged spectrum between 50 keV and 40 MeV\nfrom T0 to T0+22 s is well fit by a Band function\nwith Epeak = 775 +/- 11 keV, alpha = -0.696 +/- 0.012 \nand beta = -3.85 (+0.21/-0.31).\n\nThe event fluence (50 keV - 10 MeV) in this time interval is\n(3.74 +/- 0.03)E-04 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+14 s in the 50 keV - 10 MeV band\nis 46.1 +/- 0.3 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": 9866,
  "createdOn": 1251926343000,
  "email": "ebs@mpe.mpg.de",
  "subject": "GRB 090902B: Fermi GBM detection of a bright burst",
  "submitter": "Elisabetta Bissaldi at MPE  <ebs@mpe.mpg.de>",
  "eventId": "GRB 090902B"
}