GCN Circular 11218
Subject
GRB 100905A: Swift-BAT refined analysis
Date
2010-09-05T21:39:43Z (14 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), C. B. Markwardt (GSFC/UMD),
F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC),
M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (GWU)
(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 100905A (trigger #433442)
(Marshall, et al., GCN Circ. 11214). The BAT ground-calculated position is
RA, Dec = 31.542, 14.919 deg, which is
RA(J2000) = 02h 06m 10.0s
Dec(J2000) = +14d 55' 08.2"
with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 100%.
The mask-weighted light curve shows a single peak starting at ~T-1.7 sec,
peaking at ~T+0.5 sec, and ending at ~T+3 sec. T90 (15-350 keV) is
3.4 +- 0.5 sec (estimated error including systematics).
The time-averaged spectrum from T-1.6 to T+2.1 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.09 +- 0.19. The fluence in the 15-150 keV band is 1.7 +- 0.2 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+0.03 sec in the 15-150 keV band
is 0.6 +- 0.1 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/433442/BA/