{
  "bibcode": "2009GCN..8876....1G",
  "body": "A. Goldstein (UAH) and A.J. van der Horst (NASA/MSFC/ORAU) report \non behalf of the Fermi GBM Team: \n\n\"At 02:09:21.15 UT on 31 January 2009, the Fermi Gamma-Ray Burst Monitor \ntriggered and located GRB 090131 (trigger 255060563 / 090131090).\n\nThe on-ground calculated location, using the GBM trigger data, is \nRA = 353.0, DEC = +16.4 (J2000 degrees, equivalent to 23h 32m, 16d 26'), \nwith a statistical uncertainty of less than 1 degree (radius, 1-sigma \ncontainment) and an additional systematic error which is currently \nestimated to be 2 to 3 degrees.\nThe angle from the Fermi LAT boresight is 40 degrees.\n\nThe GBM light curve consists of two emission pulses, each with \nsubstructure and separated by a period of no significant \nemission above background.  The total duration (T90) is about \n36.4 s (8-1000 keV).  The time-averaged spectrum from T0+0.0 s to \nT0+42.2 s is best fit by a Band function with \nEpeak = 58.4 +/- 3.9 keV, alpha = -1.27 +/- 0.07, and \nbeta = -2.26 +/- 0.05 (chi-square 597.4 for 453 d.o.f.).\n\nThe event fluence (8-1000 keV) in this time interval is \n(2.23 +/- 0.17)E-05 erg/cm^2. The 1-sec peak photon flux measured \nstarting from T0+6.4 s in the 8-1000 keV band \nis 47.9 +/- 10.0 ph/s/cm^2.\n\nThe spectral and temporal analysis results presented above are \npreliminary; final results will be published in the GBM GRB Catalog.\"",
  "circularId": 8876,
  "createdOn": 1233631427000,
  "email": "adam.m.goldstein@msfc.nasa.gov",
  "subject": "GRB 090131: Fermi GBM detection",
  "submitter": "Adam Goldstein at Fermi-GBM/UAH  <adam.m.goldstein@msfc.nasa.gov>",
  "eventId": "GRB 090131"
}