{
  "bibcode": "2009GCN..8922....1V",
  "body": "A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team: \n\n\"At 07:33:37.98 UT on 01 March 2009, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 090301B (trigger 257585619 / 090301315 ).\nThe on-ground calculated location, using the GBM trigger \ndata, is RA = 350.3, DEC = 9.0 (J2000 degrees, \nequivalent to 23h 21m, 09d 00'), with an uncertainty \nof 4.2 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 56 degrees.\n\nThe GBM light curve shows a single peak lasting about 5 s \nsuperimposed on a lower-level continuum.\nThe burst duration (T90) is about 28 s (8-1000 keV)\nThe time-averaged spectrum from T0-1.536 s to T0+3.584 s is \nwell fit by a power law function with an exponential\nhigh energy cutoff.  The power law index is -1.03 +/- 0.09 and\nthe cutoff energy, parameterized as Epeak, is 546 +/- 133 keV\n(chi squared 703.17 for 731 d.o.f.).\n\nThe event fluence (8-1000 keV) in this time interval is \n(2.69 +/- 0.13)E-06 erg/cm^2. The 1-sec peak photon flux measured \nstarting from T0+1.536 s in the 8-1000 keV band \nis 4.4 +/- 0.1 ph/s/cm^2.\n\nA Band function fits the spectrum equally well \n(chi squared 700.28 for 730 d.o.f.) with Epeak= 427 +/- 147 keV, \nalpha = -0.98 +/- 0.12 and beta = -1.93 +/- 0.24. \n\nThe spectral analysis results presented above are preliminary; \nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 8922,
  "createdOn": 1235925526000,
  "email": "azk@mpe.mpg.de",
  "subject": "GRB 090301B: Fermi GBM detection",
  "submitter": "Andreas von Kienlin at MPE  <azk@mpe.mpg.de>",
  "eventId": "GRB 090301B"
}