GCN Circular 8550
P. N. Bhat (UAH), R. D. Preece (UAH) and A.J. van der Horst (NASA/ORAU) report on behalf of the Fermi GBM Team: At 21:00:53.53 UT on 18 November 2008, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 081118B (trigger 248734854 / 081118876). The on-ground calculated location, using the GBM trigger data, is RA = 54.0, DEC = -50.4 (J2000 degrees, equivalent to 03 h 36 m, 50 d 24'), with an uncertainty of 2.9 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 41 degrees. The GBM light curve consists of primarily 2 pulses. It has a duration (T90) of about 20 s (8-1000 keV). The time-averaged spectrum from T0-2.6 s to T0+27 s is well fit by a Band function with Epeak = 41.2 +/- 3.9, alpha = 0.8 +/- 0.5 and beta = -2.14 +/- 0.08. The event fluence (8-1000 keV) in this time interval is (1.12 +/- 0.61)E-7 erg/cm^2. The 1-sec peak photon flux in the 8-1000 keV band is 0.67 +/- 0.37 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog.