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GCN Circular 19020

Subject

GRB 160216A: Swift-BAT refined analysis

Date

2016-02-17T14:12:17Z (9 years ago)

From

Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>

S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), 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),
E. Troja (NASA/GSFC/UMCP), 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 downlinks,
we report further analysis of BAT GRB 160216A (trigger #673978)
(Troja, et al., GCN Circ. 19014Not found
 
 
).  The BAT ground-calculated position is
RA, Dec = 311.679, -71.550 deg, which is 
   RA(J2000)  =  20h 46m 43.0s 
   Dec(J2000) = -71d 33' 01.0" 
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 48%.
 
The mask-weighted light curve shows a small peak starting at ~T-0.3 sec,
then two large peaks at ~T+0.6 s and ~T+3.2 sec, and ending at ~T+20 sec.
T90 (15-350 keV) is 11.0 +- 1.0 sec (estimated error including systematics).
 
The time-averaged spectrum from T-0.30 to T+11.70 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.48 +- 0.08.  The fluence in the 15-150 keV band is 2.0 +- 0.1 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+0.70 sec in the 15-150 keV band
is 7.3 +- 0.5 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/673978/BA/