GRB 220714B: Swift-BAT refined analysis
Abstract
Using the data set from T-173 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 220714B (trigger #1116221) (Laha, et al., GCN Circ. 32393). The BAT ground-calculated position is RA, Dec = 47.086, -19.321 deg which is RA(J2000) = 03h 08m 20.7s Dec(J2000) = -19d 19' 13.8" with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 88%. The mask-weighted light curve shows a complex structure. The main period of emission starts around T-5 sec and continues to T+35 seconds with three main overlapping pulses. There is some precursor activity starting as early as T-45 seconds and low-level emission extending to T+60 seconds. The spacecraft slewed away from the burst location at around T+275 seconds. T90 (15-350 keV) is 50.10 +- 7.96 sec (estimated error including systematics). The time-averaged spectrum from -48.27 to +45.75 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.92 +- 0.07. The fluence in the 15-150 keV band is 4.4 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+12.89 sec in the 15-150 keV band is 3.8 +- 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/1116221/BA/
- Publication:
-
GRB Coordinates Network
- Pub Date:
- July 2022
- Bibcode:
- 2022GCN.32403....1L