GRB 231118A: 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 231118A (trigger #1197311) (Laha, et al., GCN Circ. 35101). The BAT ground-calculated position is RA, Dec = 4.840, -48.044 deg which is RA(J2000) = 00h 19m 21.7s Dec(J2000) = -48d 02' 37.5" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 55%. The light curve shows a single pulse with similar rise and fall times. There is also a dim tail extending 30 seconds after the main pulse. T90 (15-350 keV) is 37.63 +- 8.89 sec (estimated error including systematics). The time-averaged spectrum from T-6.84 to T+55.21 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.40 +- 0.07. The fluence in the 15-150 keV band is 3.7 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T-0.08 sec in the 15-150 keV band is 9.7 +- 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/1197311/BA/
- Publication:
-
GRB Coordinates Network
- Pub Date:
- November 2023
- Bibcode:
- 2023GCN.35141....1M