TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4104
SUBJECT: GRB 051016B:  Refined analysis of the Swift-BAT burst
DATE:    05/10/16 22:31:42 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <Scott@lheamail.gsfc.nasa.gov>

L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/NRC),
E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (GSFC/UMD),
H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), F. Marshall (GSFC),
D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC),
G. Sato (ISAS), T. Takahashi (ISAS), J. Tueller (GSFC)
on behalf of the Swift-BAT team:

Using the full data set from the recent telemetry downlink, we report
further analysis of Swift-BAT GRB 051016B (trigger #159994)
(Parsons, et al., GCN 4103).  The ground-analysis position is
RA,Dec 132.120,+13.627 {08h 48m 28.8s,+13d 37' 38.4"} (J2000)
with an uncertainty of 1.6 arcmin (radius, 90%, stat+sys).
The parital coding fraction is 79 %.  T90 is 4.0 +- 0.1 sec.
The lightcurve consists of two overlapping peaks at T+0.3 and T+3.0 sec.
Fitting a simple power law over the full interval from T-0.0 to T+4.6 sec,
the photon index is 2.38 +/- 0.23 with a fluence of 1.7 +/- 0.2 X 10^-7
erg/cm^2.  The peak flux in a 1-sec wide window starting at T+0.11 sec
is 1.32 +/- 0.17 ph/cm^2/sec.  All values are in the 15-150 keV band
at the 90% confidence level.