GCN Circular 13652
Subject
GRB 120815A: Swift-BAT refined analysis
Date
2012-08-15T13:14:58Z (12 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),
C. Pagani (U Leicester), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC),
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+963 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 120815A (trigger #531003)
(Pagani, et al., GCN Circ. 13645). The BAT ground-calculated position is
RA, Dec = 273.976, -52.125 deg, which is
RA(J2000) = 18h 15m 54.4s
Dec(J2000) = -52d 07' 29.0"
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 28%.
The mask-weighted light curve shows a FRED pulse starting at ~T-0.3 sec,
peaking at ~T+0.5 sec, and ending at ~T+30 sec. T90 (15-350 keV) is
9.7 +- 2.5 sec (estimated error including systematics).
The time-averaged spectrum from T-0.24 to T+11.97 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
2.29 +- 0.23. The fluence in the 15-150 keV band is 4.9 +- 0.7 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+0.17 sec in the 15-150 keV band
is 2.2 +- 0.3 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/531003/BA/