GRB 190926A: Swift-BAT refined analysis
Abstract
Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 190926*A (trigger #926515) (Melandri, et al., GCN Circ. 25848). The BAT ground-calculated position is RA, Dec = 100.616, 59.531 deg which is RA(J2000) = 06h 42m 27.9s Dec(J2000) = +59d 31' 51.2" with an uncertainty of 2.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 50%. The BAT mask-weighted light curve shows a complex structure with multiple peaks extending from roughly T-120 sec to T+450 sec. T90 (15-350 keV) is 368.9 +- 20.9 sec (estimated error including systematics). The time-averaged spectrum from T-0.00 to T+395.46 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.14 +- 0.18. 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+52.95 sec in the 15-150 keV band is 0.6 +- 0.2 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/926515/BA/
- Publication:
-
GRB Coordinates Network
- Pub Date:
- September 2019
- Bibcode:
- 2019GCN.25860....1M