[vsnet-grb-info 6790] GRB 081016B, Swift-BAT refined analysis

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  8387
SUBJECT: GRB 081016B, Swift-BAT refined analysis
DATE:    08/10/17 21:37:05 GMT
FROM:    Hans Krimm at NASA-GSFC  <hans.a.krimm at nasa.gov>

M. Stamatikos (GSFC/ORAU), S. D. Barthelmy (GSFC), W. H. Baumgartner 
(GSFC/UMBC),
J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC),
H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), K. McLean (GSFC/UMD),
K. L. Page (U Leicester),D. M. Palmer (LANL), A. M. Parsons (GSFC),
T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), J. Tueller (GSFC),
T. N. Ukwatta (GWU) (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 081016B (trigger #331856)
(Page, et al., GCN Circ. 8381).  The BAT ground-calculated position is
RA, Dec = 14.582, -43.536 deg which is
  RA(J2000)  =  00h 58m 19.8s
  Dec(J2000) = -43d 32' 07.9"
with an uncertainty of 2.3 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 98%.

The BAT mask-weighted light curve showed a single peak of duration ~2.5 
seconds.
T90 (15-350 keV) is 2.6 +- 0.8 sec (estimated error including systematics).

The time-averaged spectrum from T-0.0 to T+3.0 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
0.92 +- 0.32.  The fluence in the 15-150 keV band is 9.9 +- 1.8 x 10-08 
erg/cm2.
The 1-sec peak photon flux measured from T+0.50 sec in the 15-150 keV band
is 0.5 +- 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/331856/BA/