GCN Circular 12318

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
Not found
 
 
).

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."