GRB 180504A: 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 180504A (trigger #830822) (Lien, et al., GCN Circ. 22682). The BAT ground-calculated position is RA, Dec = 331.144, -14.665 deg which is RA(J2000) = 22h 04m 34.7s Dec(J2000) = -14d 39' 53.6" with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 61%. The mask-weighted light curve shows a triangular shaped profile, beginning at ~T-60 sec, peaking at ~T+20 sec, and decaying by T+80 sec. T90 (15-350 keV) is 88.3 +- 44.4 sec (estimated error including systematics). The time-averaged spectrum from T-25.03 to T+113.85 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.50 +- 0.13. The fluence in the 15-150 keV band is 2.2 +- 0.2 x 10^-6erg/cm2. The 1-sec peak photon flux measured from T+16.80 sec in the 15-150 keV band is 0.8 +- 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/830822/BA/
- Publication:
-
GRB Coordinates Network
- Pub Date:
- May 2018
- Bibcode:
- 2018GCN.22690....1S