TITLE: GCN CIRCULAR NUMBER: 35241 SUBJECT: GRB 231129A: Swift-BAT refined analysis DATE: 23/11/30 22:41:45 GMT FROM: Sibasish Laha at GSFC sibasish.laha@nasa.gov
D. M. Palmer (LANL), S. D. Barthelmy (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), M. Moss (GSFC), T. Parsotan (GSFC/UMBC), T. Sakamoto (AGU),M. Stamatikos (OSU) (i.e. the Swift-BAT team):
Using the data set from T-61 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 231129A (trigger #1199764) (Gropp et al., GCN Circ. 35208). The BAT ground-calculated position is RA, Dec = 317.541, 41.530 deg which is RA(J2000) = 21h 10m 09.8s Dec(J2000) = +41d 31' 48.3" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 46%.
The BAT light curve shows a complex structure with a duration of ~ 130 sec. T90 (15-350 keV) is 105.46 +- 1.83 sec (estimated error including systematics).
The time-averaged spectrum from T-1.75 to T+118.97 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.35 +- 0.17, and Epeak of 83.7 +- 14.6 keV (chi squared 51.44 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 1.3 +- 0.0 x 10^-05 erg/cm2 and the 1-sec peak flux measured from T+88.71 sec in the 15-150 keV band is 4.8 +- 0.3 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.78 +- 0.04 (chi squared 70.95 for 57 d.o.f.). 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/1199764/BA/
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