{
  "bibcode": "2009GCN..8963....1G",
  "body": "A. Goldstein (UAH) and A.J. van der Horst (NASA/MSFC/ORAU)\nreport on behalf of the Fermi GBM Team: \n\n\"At 17:36:24.70 UT on 08 March 2009, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 090308B (trigger 258226586 / 090308734).\nThis burst was also independently detected by INTEGRAL SPI-ACS.\n\nThe on-ground calculated location, using the GBM trigger \ndata, is RA = 22.4, DEC = -58.1 (J2000 degrees, \nequivalent to 01h 30m, 58d 05'), with an uncertainty \nof 2.3 degrees (radius, 1-sigma containment, \nstatistical only; there is additionally a systematic\nerror which is currently estimated to be 2 to 3 degrees).\nThe angle from the Fermi LAT boresight is 50 degrees.\n\nThe GBM light curve consists of two peaks with substructure\nwith a duration (T90) of about 2.11 s (8-1000 keV). \nThe time-averaged spectrum from T0-0.25 s to T0+1.53 s is \nwell fit by a power law function with an exponential\nhigh energy cutoff.  The power law index is -0.54 +/- 0.11 and\nthe cutoff energy, parameterized as Epeak, is 710.3 +/- 100.0 keV\n(chi squared 342 for 362 d.o.f.).\n\nThe event fluence (8-1000 keV) in this time interval is \n(3.46 +/- 0.13)E-06 erg/cm^2. The 0.128-sec peak photon flux measured \nstarting from T0+0.64 s in the 8-1000 keV band \nis 14.22 +/- 0.91 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary; \nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 8963,
  "createdOn": 1236634946000,
  "email": "adam.m.goldstein@msfc.nasa.gov",
  "subject": "GRB 090308B: Fermi GBM detection",
  "submitter": "Adam Goldstein at Fermi-GBM/UAH  <adam.m.goldstein@msfc.nasa.gov>",
  "eventId": "GRB 090308B"
}