{
  "bibcode": "2009GCN..9933....1B",
  "body": "Elisabetta Bissaldi (MPE) reports on behalf of the Fermi GBM Team:\n\n\n\"At 04:20:26.99 UT on 26 September 2009, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 090926 (trigger 275631628 / 090926181).\nThe on-ground calculated location, using the GBM trigger\ndata, is RA = 354.5, DEC = -64.2 (J2000 degrees,\nequivalent to 23h 38m, -64d 12'), 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 48 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 single pulse\nwith a duration (T90) of 20 +/- 2 s (8-1000 keV).\nThe time-averaged spectrum from T0 to T0+21 s is\nbest fit by a Band function with Epeak = 314 (+/- 4) keV,\nalpha = -0.75 (+/-0.01) and beta = -2.59 (+0.04/-0.05)\n(C-stat 1136 for 478 d.o.f.).\n\nThe event fluence (8-1000 keV) in this time interval is\n(1.45 +/- 0.04)E-04 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+3 s in the 8-1000 keV band\nis 80.8 +/- 0.4 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": 9933,
  "createdOn": 1253975231000,
  "email": "ebs@mpe.mpg.de",
  "subject": "GRB 090926: Fermi GBM detection",
  "submitter": "Elisabetta Bissaldi at MPE  <ebs@mpe.mpg.de>",
  "eventId": "GRB 090926"
}