GCN Circular 15456
Subject
GRB 131030A: Swift-BAT refined analysis
Date
2013-11-05T16:32:59Z (11 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (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), E. Troja (NASA/GSFC/UMCP), J. Tueller (GSFC), T. N. Ukwatta (MSU)
(i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlinks,
we report further analysis of BAT GRB 131030A (trigger #576238)
(Troja, et al., GCN Circ. 15402). The BAT ground-calculated position is
RA, Dec = 345.074, -5.380 deg which is
RA(J2000) = 23h 00m 17.8s
Dec(J2000) = -05d 22' 46.4"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 37%.
The mask-weighted light curve shows at least two overlapping peaks starting
at ~T-8 sec, peaking at ~T+10 sec, and ending at ~T+180 sec with a low-level
tail out to at least T+800 sec. T90 (15-350 keV) is 41.1 +- 4.0 sec
(estimated error including systematics).
The time-averaged spectrum from T-6.04 to T+143.37 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.30 +- 0.03. The fluence in the 15-150 keV band is 2.93 +- 0.04 x 10^-5 erg/cm2.
The 1-sec peak photon flux measured from T+6.40 sec in the 15-150 keV band
is 28.1 +- 0.7 ph/cm2/sec. All the quoted errors are at the 90% confidence
level.
The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/576238/BA/