GCN Circular 9812
A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team: "At 07:12:12.45 UT on 15 August 2009, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 090815 (trigger 272013134 / 090815300). The on-ground calculated location, using the GBM trigger data, is RA = 41.7, DEC = -2.0 (J2000 degrees, equivalent to 02h 47m, -02d 00'), with an uncertainty of 7.6 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error which is currently estimated to be 2 to 3 degrees). The angle from the Fermi LAT boresight is 87 degrees. The GBM light curve shows two broad pulses with a duration (T90) of about 200 s (8-1000 keV). The time-averaged spectrum from T0-5.120 s to T0+24.576 s is well fit by a simple power law function with index -1.5 +/- 0.1 (chi squared 261 for 241 d.o.f.). The event fluence (8-1000 keV) in this time interval is (3.4 +/- 0.3)E-06 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+ 3.072 s in the 8-1000 keV band is 1.9 +/- 0.3 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."