GCN Circular 10406
Sylvain Guiriec (UAH) and Dave Tierney (UCD/MPE) report on behalf of the Fermi GBM Team: "At 14:07:29 UT on 12 February 2010, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 100212A (trigger 287676444 / 100212588). This GRB has also been detected independently with Swift/BAT and the GBM location is consistent with the Swift/XRT location within the error bars (Grupe et al. GCN Circ. 10401). The angle from the Fermi LAT boresight is 15 degrees. The GRB duration (T90) is about 2.30+/-0.14 s (8-1000 keV). The time-averaged spectrum from T0-0.51 s to T0+0.26 s is adequately fit by a power law with an index of -1.62+/-0.06 (Castor C-stat 394 for 363 d.o.f.). It is also adequately fit by a power law function with an exponential high energy cutoff. The power law index is -1.15 +/- 0.20 and the cutoff energy, parameterized as Epeak, is 159.30 +/- 45.10 keV (Castor C-stat 389 for 362 d.o.f.). The event fluence (8-1000 keV) in the T90 time interval is (3.81+/-0.06)E-7 erg/cm^2. The 1-sec peak photon flux measured starting from T0-0.7 s in the 8-1000 keV band is 3.16 +/- 0.22 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."