GCN Circular 12127
Subject
GRB 110709A: Swift-BAT refined analysis
Date
2011-07-10T00:18:48Z (13 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
T. Sakamoto (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), S. T. Holland (CRESST/USRA/GSFC),
H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL),
M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU)
(i.e. the Swift-BAT team):
Using the data set from T-239 to T+733 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 110709A (trigger #456939)
(Holland, et al., GCN Circ. 12118). The BAT ground-calculated position is
RA, Dec = 238.895, 40.918 deg, which is
RA(J2000) = 15h 55m 34.8s
Dec(J2000) = +40d 55' 06.4"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 91%.
The mask-weighted light curve shows at least 8 peaks starting at T-5 sec,
with the brightest peak at ~T+34 sec, and returning to background
at ~T+100 sec. T90 (15-350 keV) is 44.7 +- 1.0 sec
(estimated error including systematics).
The time-averaged spectrum from T-4.3 to T+65.5 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.24 +- 0.03. The fluence in the 15-150 keV band is 1.0 +- 0.02 x 10^-05 erg/cm2.
The 1-sec peak photon flux measured from T+34.31 sec in the 15-150 keV band
is 6.2 +- 0.2 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/456939/BA/