TITLE: GCN CIRCULAR NUMBER: 41082 SUBJECT: GRB 250702F: Swift-BAT refined analysis DATE: 25/07/13 21:00:20 GMT FROM: Takanori Sakamoto at AGU tsakamoto@phys.aoyama.ac.jp
M. J. Moss (GSFC), S. D. Barthelmy (GSFC), R. Gupta (GSFC), N. J. Klingler (GSFC/UMBC/CRESSTII) H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Parsotan (GSFC), D. Sadaula (GSFC/UMBC), T. Sakamoto (AGU) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 250702F (trigger #1329888) (Klingler, et al., GCN Circ. 40894). The BAT ground-calculated position is RA, Dec = 212.942, 16.739 deg which is RA(J2000) = 14h 11m 46.1s Dec(J2000) = +16d 44' 20.6" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 81%.
The mask-weighted light curve shows a complex structure that starts at ~T-3 s, peaks at ~T+38 s, and ends at ~T+80 s. T90 (15-350 keV) is 63.7 +- 12.5 sec (estimated error including systematics).
The time-averaged spectrum from T-29.13 to T+76.44 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.49 +- 0.06. The fluence in the 15-150 keV band is 4.8 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+37.35 sec in the 15-150 keV band is 5.1 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at https://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1329888
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