GCN Circular 8551
Elisabetta Bissaldi (MPE) reports on behalf of the Fermi GBM Team: "At 14:49:34.57 UT on 20 November 2008, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 081120 (trigger 248885375 / 081120618). The on-ground calculated location, using the GBM trigger data, is RA = 205.4, Dec = -9.1 (J2000 degrees, equivalent to 13h 42m, -09d 06'), with an uncertainty of 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 84 degrees. The GRB light curve consists of two peaks and has a duration (T90) of about 12 s (8-1000 keV). The time-averaged spectrum from T0-3.072 s to T0+6.144 s is best fit by a Band function with Epeak = 44 +/- 5 keV, alpha = 0.4 +/- 0.5 and beta = -2.18 +/- 0.10 (chi squared 367 for 353 d.o.f.). The event fluence (8-1000 keV) in this time interval is (2.7 +/- 0.9)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+2.048 s in the 8-1000 keV band is 5.1 +/- 1.6 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."