TITLE: GCN CIRCULAR NUMBER: 9627 SUBJECT: GRB 090704: Fermi GBM observation DATE: 09/07/09 08:46:35 GMT FROM: Sheila McBreen at MPE S. McBreen (UCD/MPE) reports on behalf of the Fermi GBM Team: "At 05:47:48.18 UT on 04 July 2009, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 090704 (trigger 268379270 / 090704242) which was also detected by IBIS/ISGRI (Mereghetti et al. 2009, GCN 9620). The GBM on-ground location is consistent with the ISGRI position. The angle from the Fermi LAT boresight is 77 degrees. The GBM light curve consists of one main pulse with a duration (T90) of about 70 s (8-1000 keV). The time-averaged spectrum from T0-0 s to T0+70 s is well fit by a power law function with an exponential high energy cutoff. The power law index is -1.13 (+0.07) and the cutoff energy, parameterized as Epeak, is 233.7 (+37.6/-28.5) keV (chi squared 358 for 365 d.o.f.). The event fluence (8-1000 keV) in this time interval is (5.8 +/- 0.3)E-6 erg/cm^2. The 1-sec peak photon flux measured starting from T0+14.3 s in the 8-1000 keV band is 1.2 +/- 0.1 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."