GRB 220118A: Swift-BAT refined analysis
Abstract
Using the data set from T-240 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 220118A (trigger #1093742) (Klingler et al., GCN Circ. 31490). The BAT ground-calculated position is RA, Dec = 192.277, 22.911 deg which is RA(J2000) = 12h 49m 06.4s Dec(J2000) = +22d 54' 37.8" with an uncertainty of 1.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 22%. The mask-weighted light curve shows a single-peaked structure that starts at ~T-4 s, peaks at ~T+1 s, and ends at ~T+10 s. T90 (15-350 keV) is 10.61 +- 1.78 sec (estimated error including systematics). The time-averaged spectrum from T-3.90 to T+9.54 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.67 +- 0.12. The fluence in the 15-150 keV band is 1.8 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.68 sec in the 15-150 keV band is 3.3 +- 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/1093742/BA/
- Publication:
-
GRB Coordinates Network
- Pub Date:
- January 2022
- Bibcode:
- 2022GCN.31499....1S