GCN Circular 21296
Subject
GRB 170705A: Swift-BAT refined analysis
Date
2017-07-05T16:14:33Z (7 years ago)
From
Amy Lien at GSFC <amy.y.lien@nasa.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),
R. L. C. Starling (U Leicester), T. N. Ukwatta (LANL)
(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 170705A (trigger #760064)
(Starling et al., GCN Circ. 21289). The BAT ground-calculated position is
RA, Dec = 191.708, 18.298 deg which is
RA(J2000) = 12h 46m 50.0s
Dec(J2000) = +18d 17' 51.3"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 83%.
The mask-weighted light curve shows a multi-peaked structure that starts
at ~ T0 and ends at ~ T+300 s. The main emission occurs at ~ T0 to ~ T+40 s,
with the major peak at ~ T+14 s. T90 (15-350 keV) is 217.3 +- 18.0 sec
(estimated error including systematics).
The time-averaged spectrum from T+0.44 to T+304.86 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.65 +- 0.05. The fluence in the 15-150 keV band is 9.5 +- 0.3 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+13.41 sec in the 15-150 keV band
is 13.9 +- 0.4 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/760064/BA/
[GCN OPS NOTE(06jul17): Per author's request, the last paragaph was added.]