GCN Circular 21112
Subject
GRB 170519A: Swift-BAT refined analysis
Date
2017-05-19T15:26:19Z (8 years ago)
From
Hans Krimm at NSF/NASA-GSFC <hkrimm@nsf.gov>
H. A. Krimm (NSF/USRA), S. D. Barthelmy (GSFC), J. R. Cummings (CPI),
A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL),
T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL)
(i.e. the Swift-BAT team):
Using the data set from T-240 to T+630 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 170519A (trigger #753445)
(Ukwatta, et al., GCN Circ. 21106). The BAT ground-calculated position is
RA, Dec = 163.429, 25.374 deg which is
RA(J2000) = 10h 53m 42.9s
Dec(J2000) = +25d 22' 26.6"
with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 100%.
The mask-weighted light curve shows an initial peak starting around T-30 s, peaking
at T+0 s, and decaying by T+15 s. Then there is a second, weaker peak from about
T+180 s to T+220 s. T90 (15-350 keV) is 216.4 +- 49.4 sec (estimated error including
systematics).
The time-averaged spectrum from T-28.5 to T+255.6 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.94 +- 0.26. The fluence in the 15-150 keV band is 1.1 +- 0.2 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+0.84 sec in the 15-150 keV band
is 0.7 +- 0.1 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/753445/BA/