[vsnet-grb-info 1718] GRB050701: Swift-BAT Refined analysis

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  3558
SUBJECT: GRB050701:  Swift-BAT Refined analysis
DATE:    05/07/01 17:42:40 GMT
FROM:    Hans Krimm at NASA-GSFC  <krimm at milkyway.gsfc.nasa.gov>

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

Using the full data set from the recent telemetry downlink,
further analysis of Swift-BAT GRB050701 (GCN Circ 3556)
over the time interval of T-4.7 to T+8.9 sec with a power law fit
yields an index of 1.62 +-0.07 and a fluence of 1.9x10^-6 erg/cm2
in the 15-350 keV band and a peak flux of 3.5 +- 0.2 ph/cm2/sec
(also 15-350 keV) in a 1-sec wide window starting at T+7.3 sec.
The lightcurve has two main peaks with some pre-trigger emmission
starting at T-7 sec, and small peak at T+27 sec.

This burst occurred within the 40-arcmin search radius
of the PSR 1509-58 source in the on-board catalog.  Hence
the on-board trigger-type identification yielded a match.
This radius has been reduced to a more reasonable value
of 20 arcmin for this post-verification era.