GRB 200409A: 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 200409A (trigger #965484) (Gropp et al., GCN Circ. 27509). The BAT ground-calculated position is RA, Dec = 60.555, -50.243 deg which is RA(J2000) = 04h 02m 13.3s Dec(J2000) = -50d 14' 36.4" with an uncertainty of 2.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 75%. The mask-weighted light curve shows several overlapping pulses that start at ~T0 and ends at~T+19 s. The main peak occurs at ~T0. T90 (15-350 keV) is 17.91 +- 5.20 sec (estimated error including systematics). The time-averaged spectrum from T+0.01 to T+19.01 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.14 +- 0.44. The fluence in the 15-150 keV band is 2.3 +- 0.6 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.01 sec in the 15-150 keV band is 1.2 +- 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/965484/BA/
- Publication:
-
GRB Coordinates Network
- Pub Date:
- April 2020
- Bibcode:
- 2020GCN.27519....1B