GRB 230911C: Swift-BAT refined analysis
Abstract
Using the data set from T-61 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 230911C (trigger #1191188) (Sonbas et al., GCN Circ. 34655). The BAT ground-calculated position is RA, Dec = 226.796, -41.356 deg which is RA(J2000) = 15h 07m 11.0s Dec(J2000) = -41d 21' 21.2" with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 95%. The mask-weighted light curve shows multiple weak overlapping pulses that start at ~T-9 s and end at ~T+10 s. T90 (15-350 keV) is 16.21 +- 2.89 sec (estimated error including systematics). The time-averaged spectrum from T-8.63 to T+9.58 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.26 +- 0.28. The fluence in the 15-150 keV band is 3.8 +- 0.6 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+2.07 sec in the 15-150 keV band is 0.7 +- 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/1191188/BA/
- Publication:
-
GRB Coordinates Network
- Pub Date:
- September 2023
- Bibcode:
- 2023GCN.34675....1S