GCN Circular 15455
Subject
GRB 131105A: Fermi GBM observation
Date
2013-11-05T16:18:25Z (11 years ago)
From
Gerard Fitzpatrick at UCD <gerard.fitzpatrick@ucdconnect.ie>
G. Fitzpatrick (UCD) and P. Jenke (UAH) report on behalf of the Fermi GBM
Team:
At 02:04:53.49 UT on 05 November 2013, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 131105A (trigger 405309896/131105087), which
was also detected by Swift (Cummings et al., GCN 15446) and Konus-Wind
(Golenetskii et al, GCN 15452). The GBM on-ground location is consistent
with the Swift/XRT position (Osborne et al., GCN 15448). The angle from
the Fermi LAT boresight is 37 degrees.
The GBM light curve consists of a multiple-peak structure with a duration
(T90) of about 112 s (50-300 keV). The time-averaged spectrum from
T0-3 s to T0+121 s is adequately fit by a Band function with Epeak =
203.9 +/- 31.1 keV, alpha = -1.2 +/- 0.1, and beta = -1.8 +/- 0.1.
The event fluence (10-1000 keV) in this time interval is
(2.9 +/- 0.1)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+108 s in the 10-1000 keV band is 8.4 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog.