TITLE: GCN CIRCULAR NUMBER: 10373 SUBJECT: GRB 100130B: Fermi GBM detection DATE: 10/02/05 19:33:39 GMT FROM: Sylvain Guiriec at UAH Sylvain Guiriec (UAH) reports on behalf of the Fermi GBM Team: "At 18:38:35.46 UT on 10 January 2010, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 100130B (trigger 286569517 / 100130777). The on-ground calculated location, using the GBM trigger data, is RA = 77.63, DEC = +20.36 (J2000 degrees, equivalent to 05h10m, +20d21'), with an uncertainty of 1.41 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 89 degrees. The GBM light curve consists of 4 peaks with a duration (T90) of about 90+/-6 s (8-1000 keV). The time-averaged spectrum from T0-14 s to T0+89 s is adequately fit by a power law function with an exponential high energy cutoff. The power law index is -1.22 +/- 0.04 and the cutoff energy, parameterized as Epeak, is 208.00 +/- 17.10 keV (Castor C-stat 1074 for 483 d.o.f.). The event fluence (8-1000 keV) in this time interval is (1.342 +/- 0.047)E-5 erg/cm^2. The 1-sec peak photon flux measured starting from T0+23.55 s in the 8-1000 keV band is 3.72 +/- 0.26 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."