GCN Circular 25003
Subject
GRB 190706B: Swift-BAT refined analysis
Date
2019-07-07T02:03:38Z (5 years ago)
From
Amy Lien at GSFC <amy.y.lien@nasa.gov>
C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC),
J. R. Cummings (CPI), H. A. Krimm (NSF),
A. Y. Lien (GSFC/UMBC), D. M. Palmer (LANL),
T. Sakamoto (AGU), M. Stamatikos (OSU),
A. Tohuvavohu (PSU), 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 190706B (trigger #913302)
(Tohuvavohu et al., GCN Circ. 24993). The BAT ground-calculated position is
RA, Dec = 107.443, -29.575 deg which is
RA(J2000) = 07h 09m 46.4s
Dec(J2000) = -29d 34' 30.7"
with an uncertainty of 2.2 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 69%.
The mask-weighted light curve shows a multi-peaked structure that starts
at ~T0 and ends at ~T+30 s. The highest peak occurs at ~T+1 s.
T90 (15-350 keV) is 25.16 +- 6.35 sec (estimated error including
systematics).
The time-averaged spectrum from T-0.25 to T+27.48 sec is best fit by a
simple
power-law model. The power law index of the time-averaged spectrum is
1.90 +- 0.23. The fluence in the 15-150 keV band is 5.8 +- 0.9 x 10^-7
erg/cm2.
The 1-sec peak photon flux measured from T+0.10 sec in the 15-150 keV band
is 1.4 +- 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/913302/BA/