GCN Circular 13536
Subject
GRB 120729A, Swift-BAT refined analysis
Date
2012-07-29T16:17:26Z (12 years ago)
From
Hans Krimm at NASA-GSFC <hans.a.krimm@nasa.gov>
D. M. Palmer (LANL), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC),
H. A. Krimm (GSFC/USRA),C. B. Markwardt (GSFC), T. Sakamoto (GSFC/UMBC),
G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC),
T. N. Ukwatta (MSU)(i.e. the Swift-BAT team):
Using the data set from T-61 to T+242 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 120729A (trigger #529095)
(Ukwatta, et al., GCN Circ. 13530). The BAT ground-calculated position is
RA, Dec = 13.078, 49.936 deg which is
RA(J2000) = 00h 52m 18.8s
Dec(J2000) = +49d 56' 08.5"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 76%.
The mask-weighted light curve shows a single FRED peak with a rise of ~20 secs
and a fall of ~100 seconds. There are no significant subsidiary peaks.
T90 (15-350 keV) is 71.5 +- 17.5 sec (estimated error including systematics).
The time-averaged spectrum from T-3.08 to T+101.94 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.62 +- 0.08. The fluence in the 15-150 keV band is 2.4 +- 0.1 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T-0.03 sec in the 15-150 keV band
is 2.9 +- 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/529095/BA/