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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. 26088Loading...
 
 ).  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/