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TITLE: GCN CIRCULAR
NUMBER: 12523
SUBJECT: GRB 111103A: Swift-BAT refined analysis
DATE: 11/11/03 15:18:22 GMT
FROM: Scott Barthelmy at NASA/GSFC
T. Sakamoto (GSFC/UMBC), 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), D. M. Palmer (LANL), M. Stamatikos (OSU),
M. C. Stroh (PSU), J. Tueller (GSFC), T. N. Ukwatta (MSU)
(i.e. the Swift-BAT team):
Using the data set from T-239 to T+358 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 111103A (trigger #506902)
(Stroh, et al., GCN Circ. 12518). The BAT ground-calculated position is
RA, Dec = 327.111, -10.532 deg, which is
RA(J2000) = 21h 48m 26.7s
Dec(J2000) = -10d 31' 54.3"
with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 31%.
The mask-weighted light curve shows 4 almost overlapping peaks with the
first starting at ~T-0.5 sec, peaks at T+1, +4, +6, and +12 sec,
and the last peak ending at ~T+20 sec. T90 (15-350 keV) is 11.6 +- 0.5 sec
(estimated error including systematics).
The time-averaged spectrum from T-0.42 to T+12.14 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.30 +- 0.10. The fluence in the 15-150 keV band is 1.4 +- 0.1 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+6.04 sec in the 15-150 keV band
is 3.1 +- 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/506902/BA/
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