TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4461
SUBJECT: GRB 060109: Swift/UVOT upper limits
DATE:    06/01/10 05:54:08 GMT
FROM:    Alexander Blustin at MSSL-UCL  <ajb@mssl.ucl.ac.uk>

A. J. Blustin (UCL-MSSL), M. De Pasquale (UCL-MSSL), S. R. Rosen
(UCL-MSSL), L. Cominsky (Sonoma State U.), J. Norris (GSFC),
N. Gehrels (GSFC) on behalf of the Swift/UVOT team

The Swift/UVOT began observing the field of GRB 060109 at 16:56:13 UT
on 2006-01-09 whilst settling on the target, 92 s after the BAT trigger
(De Pasquale et al., GCN 4455). No new source is detected at the XRT
position (reported by De Pasquale et al.) in coadded images with any of
the filters down to the following 3-sigma magnitude upper limits. These
values are not corrected for Galactic extinction; E(B-V) = 0.144.

Filter   T_range(s)  Exp(s)  3sigUL(mag)

V        92-22100    1449    20.0
B        312-18155   1132    20.8
U        637-17925   1038    20.5
W1       613-17696   1001    19.9
M2       589-22330   1233    20.3
W2       542-21871   1262    19.9
White    517-18385   1018    20.9