GRB 241026A: Swift-BAT refined analysis

Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 241026A (trigger #1262764) (Melandri, et al., GCN Circ. 37896). The BAT ground-calculated position is RA, Dec = 293.425, 57.996 deg which is RA(J2000) = 19h 33m 41.9s Dec(J2000) = +57d 59' 46.7" with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 17%. The mask-weighted light curve shows a single-pulse structure that starts at T-2 s, peaks at T0 s, and ends at T+31 s. T90 (15-350 keV) is 25.2 +- 5.6 sec (estimated error including systematics). The time-averaged spectrum from T-1.34 to T+30.98 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.56 +- 0.12. The fluence in the 15-150 keV band is 2.5 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-0.29 sec in the 15-150 keV band is 4.0 +- 0.5 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/1262764