{
  "bibcode": "2009GCN..8912....1V",
  "body": "A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team: \n\n\"At 04:17:09.58  UT on 22 February 2009, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 090222 (trigger 256969031 / 090222179).\n\nThe on-ground calculated location, using the GBM trigger \ndata, is RA = 120.2, DEC = +43.4 (J2000 degrees, \nequivalent to 08h 01m, +43d 24'), with an uncertainty \nof 5.5 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 80 degrees.\n\nThe GBM light curve shows one main peak with substructure \nwith a duration (T90) of about 18 s (8-1000 keV). \nThe time-averaged spectrum from T0-2.688 s to T0+14.720 s is \nwell fit by a power law function with an exponential\nhigh energy cutoff.  The power law index is -1.00 +/- 0.11 \nand the cutoff energy, parameterized as Epeak, is 157.7 +/- 19.8 keV\n(chi squared 523.89 for 480 d.o.f.).\n\nThe event fluence (8-1000 keV) in this time interval is \n(2.19 +/- 0.19)E-06 erg/cm^2. The 1-sec peak photon flux measured \nstarting from T0+6.528 s in the 8-1000 keV band \nis 1.10 +/- 0.14 ph/s/cm^2.\n\nA Band function fits the spectrum equally well \n(chi squared 522.58 for 479 d.o.f.) with \nEpeak= 147.9 +/- 27.1  keV, alpha = -0.97 +/- 0.14 \nand beta = -2.56 +/- 0.66. \n\nThe spectral analysis results presented above are preliminary; \nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 8912,
  "createdOn": 1235319796000,
  "email": "azk@mpe.mpg.de",
  "subject": "GRB 090222: Fermi GBM detection",
  "submitter": "Andreas von Kienlin at MPE  <azk@mpe.mpg.de>",
  "eventId": "GRB 090222"
}