GCN Circular 26110
Subject
GRB 191029A: Swift-BAT refined analysis
Date
2019-10-31T19:46:10Z (5 years ago)
From
Hans Krimm at NSF/NASA-GSFC <hkrimm@nsf.gov>
A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI),
P. A. Evans (U Leicester), H. A. Krimm (NSF), S. Laha (GSFC/UMBC),
C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU),
M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+240 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 191029A (trigger #932058)
(Evans, et al., GCN Circ. 26088). The BAT ground-calculated position is
RA, Dec = 352.140, -40.464 deg which is
RA(J2000) = 23h 28m 33.6s
Dec(J2000) = -40d -27' -49.8"
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 46%.
The mask-weighted light curve shows a pair of weak pulses spanning the period
from approximately T-5 to T+35 seconds. T90 (15-350 keV) is 39.5 +- 7.9 sec
(estimated error including systematics).
The time-averaged spectrum from T-1.05 to T+45.85 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.77 +- 0.21. The fluence in the 15-150 keV band is 1.1 +- 0.1 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+1.90 sec in the 15-150 keV band
is 1.1 +- 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/932058/BA/