GCN Circular 23873
Subject
GRB 190203A: Swift-BAT refined analysis
Date
2019-02-05T03:40:35Z (5 years ago)
From
Amy Lien at GSFC <amy.y.lien@nasa.gov>
D. M. Palmer (LANL), S. D. Barthelmy (GSFC),
J. R. Cummings (CPI), H. A. Krimm (NSF/USRA),
A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),
T. Sakamoto (AGU), M. Stamatikos (OSU),
T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-213 to T+456 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 190203A (trigger #887512)
(Lien et al., GCN Circ. 23845). The BAT ground-calculated position is
RA, Dec = 22.603, 55.736 deg which is
RA(J2000) = 01h 30m 24.7s
Dec(J2000) = +55d 44' 10.5"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 21%.
The mask-weighted light curve shows several overlapping pulses that starts ~ T-60 s
and ends at T+40 s. Note that there is a large data gap from T-117.652 s to T-60.784 s,
so it is possible that there is additional burst emission during this interval.
T90 (15-350 keV) is 96 +- 16 sec (estimated error including systematics).
The time-averaged spectrum from T-60.784 to T+ 43.216 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.06 +- 0.06. The fluence in the 15-150 keV band is 1.5 +- 0.05 x 10^-5 erg/cm2.
The 1-sec peak photon flux measured from T+2.72 sec in the 15-150 keV band
is 3.1 +- 0.6 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/887512/BA/