[vsnet-grb-info 14001] GRB 131004A: Fermi GBM observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15315
SUBJECT: GRB 131004A: Fermi GBM observation
DATE:    13/10/06 02:20:22 GMT
FROM:    Shaolin Xiong at UAH  <sx0002 at uah.edu>

Shaolin Xiong (UAH)
reports on behalf of the Fermi GBM Team:

"At 21:41:03.68 UT on 04 October 2013, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 131004A (trigger 402615666 / 131004904),
which was also detected by the Swift/BAT (Hagen et al. 2013, GCN 15303).
The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 93 degrees.

The GBM light curve consists of multiple pulses
with a duration (T90) of about 1.4 s (50-300 keV).
The time-averaged spectrum from T0-0.19 s to T0+0.58 s is
well fit by a simple power law function with index -1.75 +/- 0.06.

The event fluence (10-1000 keV) in this time interval is
(6.2 +/- 0.6)E-7 erg/cm^2. The 64 ms peak photon flux measured
starting from T0+0.192 s in the 10-1000 keV band
is 10.4 +/- 1.6 ph/s/cm^2.

The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."