[vsnet-grb-info 16753] GRB 150716A: Swift-BAT refined analysis

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18034
SUBJECT: GRB 150716A: Swift-BAT refined analysis
DATE:    15/07/17 22:22:06 GMT
FROM:    Tilan Ukwatta at LANL  <tilan.ukwatta at gmail.com>

A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC),
J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC),
D. Kocevski (NASA/GSFC/ORAU), H. A. Krimm (GSFC/USRA),
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-61 to T+242 sec from the recent
telemetry downlink, we report further analysis of
BAT GRB 150716A (trigger #649157) (Kocevski, et al.,
GCN Circ. 18027). The BAT ground-calculated position is
RA, Dec = 278.481, -12.978 deg which is
   RA(J2000)  =  18h 33m 55.4s
   Dec(J2000) = -12d 58' 40.8"
with an uncertainty of 1.1 arcmin, (radius, sys+stat,
90% containment). The partial coding was 91%.

BAT light curve shows a single peak starting around T+5 sec
and ending around T+60 sec. T90 (15-350 keV) is
44 +- 6 sec (estimated error including systematics).

The time-averaged spectrum from T-4.19 to T+50.02 sec is
best fit by a simple power-law model.  The power law index
of the time-averaged spectrum is 1.54 +- 0.10.  The fluence
in the 15-150 keV band is 1.5 +- 0.1 x 10^-06 erg/cm2.
The 1-sec peak photon flux measured from T+9.69 sec in the
15-150 keV band is 0.8 +- 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/649157/BA/