GRB 191213A: Swift-BAT refined analysis
Abstract
Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 191213A (trigger #944091) (Cenko et al., GCN Circ. 26398). The BAT ground-calculated position is RA, Dec = 224.530, -9.745 deg which is RA(J2000) = 14h 58m 07.2s Dec(J2000) = -09d 44' 41.9" with an uncertainty of 2.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 56%. The mask-weighted light curve shows some weak emission that starts at ~T-30 s and remains detectable until the burst went out of the BAT FOV at T+139 s. It is likely that the emission continues beyond T+139 s. The burst did not come back into the BAT FOV within the next ~ 2 hours. The time-averaged spectrum from T-33.52 to T+104.01 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.49 +- 0.16. The fluence in the 15-150 keV band is 2.1 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+99.95 sec in the 15-150 keV band is 0.5 +- 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/944091/BA/
- Publication:
-
GRB Coordinates Network
- Pub Date:
- December 2019
- Bibcode:
- 2019GCN.26418....1L