GRB 231230A: 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 231230A (trigger #1205319) (Moss, et al., GCN Circ. 35436). The BAT ground-calculated position is RA, Dec = 245.223, 58.132 deg which is RA(J2000) = 16h 20m 53.5s Dec(J2000) = +58d 07' 54.2" with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 35%. The mask-weighted light curve shows a complex structure extending from around T+0 to T+20. T90 (15-350 keV) is 15.2 +- 0.9 sec (estimated error including systematics). The time-averaged spectrum from T+0.26 to T+17.26 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.28 +- 0.10. The fluence in the 15-150 keV band is 2.1 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+7.64 sec in the 15-150 keV band is 2.2 +- 0.4 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/1205319/BA/
- Publication:
-
GRB Coordinates Network
- Pub Date:
- January 2024
- Bibcode:
- 2024GCN.35474....1L