[vsnet-grb-info 2079] GRB 050904: BAT refined analysis of partial data set

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  3918
SUBJECT: GRB 050904: BAT refined analysis of partial data set
DATE:    05/09/05 02:46:12 GMT
FROM:    Jay R. Cummings at NASA/GSFC/Swift  <jayc at milkyway.gsfc.nasa.gov>

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

Using only a small amount of the full data set from recent telemetry
downlinks, we report further analysis of Swift-BAT Trigger #153514
(Cummings, et al., GCN 3910).  Due to a large backlog in data downlinking,
we have only the data from T-40 to T+120 sec.  We do not expect the full
data set for at least another 2 days, so we are issuing this partial report.
The ground-analysis position is RA,Dec 13.722,14.081 {0h54m53s, 14d04'52"}
(J2000) with an uncertainty of 2.6 arcmin (radius, 90%, stat+sys).
This is 3.9 arcmin from the onboard position and 0.54 arcmin from the
IR afterglow position reported by Haislip et al.  in GCN Circ. 3913.

This is a long burst with T90 greater than 120 sec.  The burst started
at T+0 sec with continued emission past T+120 sec (where the downlinked
data stops).