TITLE: GCN CIRCULAR NUMBER: 41083 SUBJECT: GRB 250706A: Swift-BAT refined analysis DATE: 25/07/13 21:01:31 GMT FROM: Takanori Sakamoto at AGU tsakamoto@phys.aoyama.ac.jp
D. M. Palmer (LANL), S. D. Barthelmy (GSFC), R. Gupta (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), M. J. Moss (GSFC), T. Parsotan (GSFC), D. Sadaula (GSFC/UMBC), T. Sakamoto (AGU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 250706A (trigger #1330958) (Moss, et al., GCN Circ. 40988). The BAT ground-calculated position is RA, Dec = 284.011, 32.327 deg which is RA(J2000) = 18h 56m 02.7s Dec(J2000) = +32d 19' 36.8" with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 26%.
The mask-weighted light curve shows a single-peak structure that starts at ~T-1 s, peaks at ~T+2 s, and ends at ~T+40 s. T90 (15-350 keV) is 31.9 +- 7.2 sec (estimated error including systematics).
The time-averaged spectrum from T0 to T+40 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.34 +- 0.17. The fluence in the 15-150 keV band is 1.6 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+1.93 sec in the 15-150 keV band is 1.3 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at https://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1330958
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