{
  "bibcode": "2009GCN..9962....1R",
  "body": "Arne Rau (MPE)  \nreport on behalf of the Fermi GBM Team:\n\n\"At 04:33:03.97  UT on 29 September 2009, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 090929A (trigger 275891585  / 090929190).\n\nThe on-ground calculated location, using the GBM trigger\ndata, is RA = 51.7, DEC = -7.3 (J2000 degrees,\nequivalent to 03h 27m, -07d 18'), with an uncertainty\nof 1.3 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 122 degrees.\n\nThis burst was also independently detected by INTEGRAL SPI-ACS.\n\nThe GBM light curve consists of multiple short peaks\nwith a duration (T90) of about 8.5 +/- 0.4 s (8-1000 keV).\nThe time-averaged spectrum from T0+0.002s to T0+4.896s is\nbest fit by a power law function with an exponential\nhigh energy cutoff.  The power law index is -0.52 +/- 0.06 and\nthe cutoff energy, parameterized as Epeak, is 610.9 +/- 44.5 keV\n(chi squared 439 for 393 d.o.f.).\n\nThe event fluence (8-1000 keV) in this time interval is\n(1.06 +/- 0.03)E-05 erg/cm^2. The 1.822-sec peak photon flux measured\nstarting from T0+0.002 s in the 8-1000 keV band is 10.9 +/- 0.3 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 9962,
  "createdOn": 1254210374000,
  "email": "arau@mpe.mpg.de",
  "subject": "GRB 090929A: Fermi GBM detection",
  "submitter": "Arne Rau at MPE  <arau@mpe.mpg.de>",
  "eventId": "GRB 090929A"
}