TITLE:   GCN CIRCULAR
NUMBER:  22088
SUBJECT: GRB 171102B: Swift-BAT refined analysis
DATE:    17/11/03 13:03:02 GMT
FROM:    Amy Lien at GSFC  <amy.y.lien@nasa.gov>

C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC),
J. R. Cummings (CPI), H. A. Krimm (NSF/USRA),
A. Y. Lien (GSFC/UMBC), 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-240 to T+963 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 171102B (trigger #785510)
(Ukwatta et al., GCN Circ. 22082).  The BAT ground-calculated position is
RA, Dec = 288.096, 22.434 deg which is
   RA(J2000)  =  19h 12m 23.0s
   Dec(J2000) = +22d 26' 03.2"
with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 22%.

The mask-weighted light curve shows a weak pulse that starts at ~ T-6 s and
ends at ~ T+14 s. T90 (15-350 keV) is 17.8 +- 3.1 sec (estimated error including
systematics).

The time-averaged spectrum from T-6.18 to T+13.72 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.16 +- 0.24.  The fluence in the 15-150 keV band is 9.3 +- 1.4 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+3.51 sec in the 15-150 keV band
is 1.2 +- 0.4 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/785510/BA/