GCN Circular 22951
Subject
GRB 180715A: Swift-BAT refined analysis
Date
2018-07-16T00:39:59Z (6 years ago)
From
Amy Lien at GSFC <amy.y.lien@nasa.gov>
T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC),
J. R. Cummings (CPI), H. A. Krimm (NSF/USRA),
A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),
D. M. Palmer (LANL), T. Sakamoto (AGU),
M. Stamatikos (OSU) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 180715A (trigger #848048)
(Ukwatta et al., GCN Circ. 22947). The BAT ground-calculated position is
RA, Dec = 235.085, -0.899 deg which is
RA(J2000) = 15h 40m 20.5s
Dec(J2000) = -00d 53' 57.6"
with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 85%.
The mask-weighted light curve shows a double-peaked structure that starts
at ~T-0.1 and ends at ~T+0.6, The two peaks occur at ~T+0.1 and ~T+0.5,
respectively. T90 (15-350 keV) is 0.68 +- 0.09 sec (estimated error including
systematics).
The time-averaged spectrum from T-0.14 to T+0.63 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
0.74 +- 0.27. The fluence in the 15-150 keV band is 1.3 +- 0.2 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T-0.26 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/848048/BA/