GCN Circular 8476
Subject
Fermi Detection of GRB 081102
Event
Date
2008-11-04T16:32:24Z (18 years ago)
From
Chryssa Kouveliotou at MSFC <chryssa.kouveliotou@nasa.gov>
C. Kouveliotou (NASA/MSFC) and M.S. Briggs (UAHuntsville) report on
behalf of the Fermi GBM Team:
At 17:44:21.6 UT on 02 November 2008, the Fermi GBM triggered and
located an event (trigger 247340662 / 081102739) which was also seen by
SWIFT (Ukwata et al. 2008, GCN 8462). The GBM on-ground location is
consistent with the Swift position; the GBM trigger time is 17.4 s
earlier than the Swift trigger.
The GBM light curve shows a multiple peak event (three and possibly four
peaks) with T90= 88 s (50-300 keV). The time-averaged spectrum from
T0-2.048 s to T0+46.01 s is best fit by a exponentially cutoff power law
model with Epeak = 88.7 +/- 8.3 keV, and index 0.0 +/- 0.3 (chi squared
278 for 238 d.o.f.). The event fluence (50-300 keV) in this time
interval is (2.1 +/- 0.05)E-06 erg/cm^2. A Band function fit the
spectrum equally well (chi squared 276 for 237 d.o.f.) with Epeak=72 +/-
13, alpha = 0.44 +/- 0.58 and beta = -2.36 +/- 0.32.
The spectral analysis results presented above are preliminary; final
results will be published in the GBM GRB Catalog.