[vsnet-grb-info 14173] GRB 131110A BAT refined analysis

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15487
SUBJECT: GRB 131110A BAT refined analysis
DATE:    13/11/15 02:24:09 GMT
FROM:    Jay R. Cummings at NASA/GSFC/Swift  <james.r.cummings at nasa.gov>

J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/UMBC),
C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU),
M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU)

We report further analysis of the ground-detected Swift-BAT slew GRB 131110A
(Cummings and Palmer, GCN circ # 15483).  The best BAT position is
RA, Dec 69.268, -17.259 which is

RA (J2000)    04h 37m 4.4s
Dec (J2000)  -17d 15' 34"

with an estimated 90% containment radius of 0.8 arcmin.

The BAT mask-weighted lightcurve shows a single broad peak with a slow rise to a
plateau at T+25 seconds, lasting about 70 seconds, and a slow decay.  T90 is about
100 +- 10 seconds.

The average spectrum from T0 to T+90 (after which the source had a low mask coding
factor in BAT) is best fit by a simple power law function with a photon index of
1.61 +- 0.09.  The fluence from 15-150 keV during this interval was
(3.53 +- 0.10) x 10^-6 ergs/cm^2/sec.  Errors are 90% confidence.

A Swift TOO has been approved with the observation number 20327, to be performed
11/15/2013.