[vsnet-grb-info 2340] GRB051028: Swift/UVOT upper limits

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4177
SUBJECT: GRB051028: Swift/UVOT upper limits
DATE:    05/10/29 15:16:45 GMT
FROM:    Alexander Blustin at MSSL-UCL  <ajb at mssl.ucl.ac.uk>

A. J. Blustin, M. J. Page, M. De Pasquale, S. R. Oates (UCL-MSSL),
K. Hurley (Berkeley), M. Chester (PSU), N. Gehrels (GSFC) report
on behalf of the Swift/UVOT team:

The Swift/UVOT began observing the field of GRB 051028 at
20:44:06 UT on 2005-10-28, 7.1 hours after the HETE trigger (Hurley
et al. GCN 4172). No new source (with respect to the DSS) was
detected at the XRT (Racusin et al. GCN 4174) or WHT (Jelinek et al.
GCN 4175, Pandey et al. GCN 4176) positions in summed images from
the four UVOT filters used down to the following 3-sigma upper
limits:

Filter  T_range(hours)  Exp(sec)  3sigUL
V       7.4-10.3        1441      20.2
W1      8.7-10.8        1700      21.1
M2      8.5-10.5        1763      21.4
W2      7.1-9.1         1456      21.4

We note that this burst is at low galactic latitude, with an
E(B-V) of 0.21 and A_v of 0.71 mag.