TITLE: GCN CIRCULAR NUMBER: 12318 SUBJECT: GRB110825A: Fermi GBM observation DATE: 11/08/30 21:11:14 GMT FROM: Sinead McGlynn at Excellence Cluster/TUM S. McGlynn (MPE/Excellence Cluster) reports on behalf of the Fermi GBM Team: "At 02:26:50.94 UT on 25 August 2011, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 110825A (trigger 335932012 / 110825102), which was also localised by the IPN (Hurley et al. 2011, GCN 12307). The angle from the Fermi LAT boresight at trigger time was 65 degrees. Approximately 100 s from trigger time, the Fermi spacecraft executed an automatic maneuver in response to a command from GBM, in order to place the burst closer to the LAT boresight. The GBM light curve shows a soft precursor (~2s) followed by 2 bright peaks from T0+10s to T0+25s, with a possible soft tail at T0+75 to T0+85s. The duration (t90) is 62.5 +/- 0.2 s (50-300 keV). The time-averaged spectrum from T0-0.64 s to T0+82.3 s is best fit by a Band function with Epeak = 233.6 (+21.9/-19.9) keV, alpha = -1.23 (+/-0.03), and beta = -2.04 (+0.06/-0.08) (C-Stat 719.72 for 490 d.o.f.). The event fluence (10-1000 keV) in this time interval is (5.45 +/- 0.70)E-5 erg/cm^2. The 1 s peak photon flux measured starting from T0+15.5 s in the 10-1000 keV band is 53.7 +/- 0.4 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."