GCN Circular 11477
A.J. van der Horst (USRA) reports on behalf of the Fermi GBM Team: "At 16:28:13.12 UT on 19 December 2010, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 101219B (trigger 314468895 / 101219686), which was also detected by the Swift/BAT (GCN 11473). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 59 degrees. The GBM light curve consists of one peak with a duration (T90) of 51 +/- 2 s (50-300 keV). The time-averaged spectrum from T0-4.1 s to T0+47.1 s is best fit by a Band function with Epeak = 70 +/- 8 keV, alpha = 0.33 +/- 0.36, and beta = -2.12 +/- 0.12. The event fluence (10-1000 keV) in this time interval is (5.5 +/- 0.4)E-6 erg/cm^2. The 1-sec peak photon flux measured starting from T0+5.6 s in the 10-1000 keV band is 2.0 +/- 0.2 ph/s/cm^2. The temporal and spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."