GCN Circular 16090
Subject
GRB 140408A: Swift-BAT refined analysis
Date
2014-04-09T14:31:03Z (11 years ago)
From
Amy Lien at GSFC <amy.y.lien@nasa.gov>
T. N. Ukwatta (MSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
J. R. Cummings (GSFC/UMBC), V. D'Elia (ASDC), N. Gehrels (GSFC),
H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/UMBC), C. B. Markwardt (GSFC),
D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC),
(i.e. the Swift-BAT team):
Using the data set from T-180 to T+902 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 140408A (trigger #595141)
(D'Elia, et al., GCN Circ. 16082). The BAT ground-calculated position is
RA, Dec = 290.723, -12.585 deg which is
RA(J2000) = 19h 22m 53.5s
Dec(J2000) = -12d 35' 07.7"
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 40%.
The mask-weighted light curve shows a single-pulse structure starts at ~T-1 sec,
peaks at ~ T+1 sec, and ends at ~T+4 sec. T90 (15-350 keV) is 4.00 +- 1.41 sec
(estimated error including systematics).
The time-averaged spectrum from T-0.66 to T+3.34 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.49 +- 0.25. The fluence in the 15-150 keV band is 3.1 +- 0.5 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+0.34 sec in the 15-150 keV band
is 1.2 +- 0.3 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/595141/BA/