{
  "bibcode": "2008GCN..8316....1P",
  "body": "Bill Paciesas, Michael Briggs and Rob Preece\n(UAH), report on behalf of the Fermi Gamma-ray Burst Monitor Team:\n\n\"At 15:04:56 UT on 28 September 2008, the Fermi Gamma-Ray Burst Monitor\n(GBM) triggered and located GRB 080928 (trigger 244307097 / 080928.628),\nwhich had triggered the Swift BAT ~204 s earlier (Sakamoto et al. GCN 8292).\nThe on-ground calculated location, using the GBM trigger data, is RA = 93.9,\nDec = -53.1 (+/- 4.9)(J2000 degrees), with an uncertainty of 4.9 degrees\n(radius, 1-sigma containment, statistical only; there is additionally a\nsystematic error which is currently estimated to be 2 to 3 degrees),\nconsistent with the Swift location (Sakamoto et al. GCN 8292; Osborne et al.\n8295).\n\nThe emission detected by GBM lasted about 87 s with the strongest emission\nin the first 20 s, and is approximately coincident with the main emission\ndetected by Swift (Cummings et al. GCN 8294).  The time-averaged spectrum\nfrom T-5 to T+24 s can be fit by a power-law with an index of -1.80 +/-\n0.08. The fluence between 50 and 300 keV over these 87 seconds is (1.5 +/-\n.1) x 10^-6 erg/cm^2.\n\nThe spectral analysis results presented above are preliminary; the final\nresults will be published in the GBM GRB Catalog.\"",
  "circularId": 8316,
  "createdOn": 1223050657000,
  "email": "bill.paciesas@nasa.gov",
  "subject": "GRB 080928:  Fermi GBM detection",
  "submitter": "Bill Paciesas at UAH  <bill.paciesas@nasa.gov>",
  "eventId": "GRB 080928"
}