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GCN Circular 20233

Subject

GRB 161202A: Swift-BAT refined analysis

Date

2016-12-04T02:10:37Z (8 years ago)

From

Amy Lien at GSFC <amy.y.lien@nasa.gov>

J. R. Cummings (CPI), S. D. Barthelmy (GSFC),
N. Gehrels (GSFC), H. A. Krimm (NSF/USRA),
A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),
D. M. Palmer (LANL), T. Sakamoto (AGU),
B. Sbarufatti (INAF-OAB/PSU), M. Stamatikos (OSU),
T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):

Using the data set from T-240 to T+962 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 161202A (trigger #725036)
(Sbarufatti, et al., GCN Circ. 20227Not found
 
 
).  The BAT ground-calculated position is
RA, Dec = 356.904, 19.652 deg which is
  RA(J2000)  =  23h 47m 36.9s
  Dec(J2000) = +19d 39' 06.3"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 86%.

The first peaks of the burst occurred before it came into the BAT field of view
at ~T-67 s. The mask-weighted light curve shows more than ten pulses that
last till ~T+80 s.

The time-averaged spectrum from T-63.41 to T+65.79 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.55 +- 0.05.  The fluence in the 15-150 keV band is 8.6 +- 0.3 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+2.11 sec in the 15-150 keV band
is 5.9 +- 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/725036/BA/