{
  "subject": "GRB 090926B: Fermi GBM detection",
  "eventId": "GRB 090926B",
  "bibcode": "2009GCN..9957....1B",
  "createdOn": 1254101691000,
  "circularId": 9957,
  "submitter": "Michael S. Briggs at UAH and MSFC  <michael.briggs@nasa.gov>",
  "email": "michael.briggs@nasa.gov",
  "body": "Michael S. Briggs (UA Huntsville), reports on behalf of the Fermi GBM Team:\n\n\"At 21:55:28.53 UT on 26 Sept 2009, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 090926B (trigger 275694930  / 090926.914),\nwhich also triggered the Swift BAT 19 seconds later (D. Grupe et al.,\nGCN 9935).   The GBM location is consistent with the Swift BAT location.\nThe angle from the Fermi LAT boresight is approximately 100 degrees.\n\nThe GBM light curve shows multiple peaks with a duration (T90)\nof 81 +/- 13 s (10 to 1000 keV). The time-averaged spectrum from T0 to\nT0+48.6 s is best fit by cutoff power law with Epeak = 91 +/- 2 keV and \nindex\n= -0.13 +/- 0.06.   The fluence (10 to 1000 keV) in this time interval is\n(8.7 +/- 0.3)E-06 erg/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog.\""
}