[vsnet-grb-info 2224] GRB051006: Refined analysis of the Swift-BAT burst

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4063
SUBJECT: GRB051006: Refined analysis of the Swift-BAT burst
DATE:    05/10/06 23:15:49 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <Scott at lheamail.gsfc.nasa.gov>

D. Palmer (LANL), L. Barbier (GSFC), S. Barthelmy (GSFC),
J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC),
K. Gendreau (GSFC), D. Hullinger (GSFC/UMD), H. Krimm (GSFC/USRA),
C. Markwardt (GSFC/UMD), P. Meszaros (PSU), A. Parsons (GSFC),
T. Sakamoto (GSFC/NRC), G. Sato (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 Trigger #158593 (Norris, et al., GCN 4061).
The ground-analysis position is RA,Dec 110.808,+9.510
{7h 23m 13.8s,+9d 30' 36.3"} (J2000) with an uncertainty
of 1.7 arcmin (radius, 90%, stat+sys).  T90 is 26 +- 1 sec.
The lightcurve has an initial cluster of 3 overlapping peaks at T-5 to T+8 sec
and a fourth peak at T+20 sec.  Fitting a simple power law
over the full interval from T-5.9 to T+24.7 sec, the photon index
is 1.4 +/- 0.2 with a fluence of 1.28 +/- 0.13 X 10^-6 erg/cm^2.
The peak flux in a 1-sec wide window starting at T+3.2 sec
is 1.9 +/- 0.3 ph/cm^2/sec.  All values are in the 15-150 keV band
at the 90% confidence level.