[vsnet-grb-info 17742] GRB 160313A, Swift-BAT refined analysis

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  19181
SUBJECT: GRB 160313A, Swift-BAT refined analysis
DATE:    16/03/13 21:59:08 GMT
FROM:    Amy Lien at GSFC  <amy.y.lien at nasa.gov>

S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), A. D'Ai (INAF-IASFPA),
N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC),
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-691 to T+962 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 160313A (trigger #678929)
(A. D'Ai et al., GCN Circ. 19171).  The BAT ground-calculated position is
RA, Dec = 183.821, 57.278 deg which is
  RA(J2000)  =  12h 15m 17.0s
  Dec(J2000) = +57d 16' 40.1"
with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 80%.

The mask-weighted light curve shows a complex structure with several
overlapping pulses. The structure starts at ~ T-5 s and ends at ~ T+45 s.
T90 (15-350 keV) is 42.6 +- 6.4 sec (estimated error including systematics).

The time-averaged spectrum from T-5.6 to T+44.7 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.36 +- 0.23.  The fluence in the 15-150 keV band is 5.8 +- 0.8 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+24.79 sec in the 15-150 keV band
is 0.4 +- 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/678929/BA/