GRB 230818A: Swift-BAT refined analysis
Abstract
Using the data set from T-60 to T+200 sec from the recent telemetry downlink, we report further analysis of BAT GRB 230818A (trigger #1186032) (Tohuvavohu, et al., GCN Circ. 34479). The BAT ground-calculated position is RA, Dec = 285.888, 40.888 deg which is RA(J2000) = 19h 03m 33.2s Dec(J2000) = +40d 53' 16.5" with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 32%. The mask weighted light curve shows a single fast rise exponential decay peak. T90 (15-350 keV) is 9.82 +- 1.25 sec (estimated error including systematics). The time-averaged spectrum from T+0.07 to T+12.10 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.36 +- 0.10. The fluence in the 15-150 keV band is 1.9 +- 0.1 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+1.59 sec in the 15-150 keV band is 6.7 +- 0.5 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/1186032/BA/ <http://gcn.gsfc.nasa.gov/notices_s/1186032/BA/>
- Publication:
-
GRB Coordinates Network
- Pub Date:
- August 2023
- Bibcode:
- 2023GCN.34515....1M