GCN Circular 11489
Sheila McBreen reports on behalf of the Fermi GBM Team: "At 05:27:13.86 UT on 24 December 2010, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 101224A (trigger 314861235/101224227), which was also detected by the Swift/BAT (Krimm et al. 2010, GCN 11484). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 72 degrees. The GBM light curve consists of one pulse with a duration of about 0.2 s (50-300 keV). The time-averaged spectrum from T0-0.064 to T0+0.256 s is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is -0.83 (+0.38/-0.30) and the cutoff energy, parameterized as Epeak, is 330 (+402/-150) keV (CSTAT 509 for 488 d.o.f.). The event fluence (10-1000 keV) in this time interval is (2.4 +/- 0.5)E-07 erg/cm^2. The 64 ms peak photon flux measured starting from T0-0.064 s in the 10-1000 keV band is 5.40 +/- 0.82 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."