GRB 191218A: Swift-BAT refined analysis
Abstract
Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 191218A (trigger #944916) (Troja et al., GCN Circ. 26480). The BAT ground-calculated position is RA, Dec = 301.070, -40.277 deg which is RA(J2000) = 20h 04m 16.7s Dec(J2000) = -40d 16' 38.8" with an uncertainty of 1.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 9%. The mask weighted light curve shows two peaks at ~T+4 s and ~T+45 s. The overall structure starts at ~T-2 s and lasts till ~T+58 s. T90 (15-350 keV) is 44.67 +- 0.73 sec (estimated error including systematics). The time-averaged spectrum from T-0.23 to T+46.03 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.12 +- 0.10. The fluence in the 15-150 keV band is 7.8 +- 0.4 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.66 sec in the 15-150 keV band is 6.3 +- 0.9 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/944916/BA/
- Publication:
-
GRB Coordinates Network
- Pub Date:
- December 2019
- Bibcode:
- 2019GCN.26495....1M