\begin{table}%t2
\caption{VLT observation log for GRB~061006.}
%\centerline
{          
\begin{tabular}{ccccccc} \hline\hline
Mean time         &  Exposure time             & Time since GRB & Seeing     &  Instrument  &  Magnitude          & Filter / grism \\
(UT)              &  (s)                       & (days)         & (\arcsec)  &              &                     &                \\ \hline
2006 Oct. 07.32063 &  $10 \times 180$           &  0.62214  	& $0.8$      & VLT/FORS1    & $22.35 \pm 0.05$    & $I$ 	   \\
2006 Oct. 08.30600 &  $10 \times 180$           &  1.91352  	& $0.8$      & VLT/FORS1    & $22.94 \pm 0.07$    & $I$ 	   \\
2006 Oct. 09.19919 &  $7  \times 180$           &  2.50080  	& $0.9$      & VLT/FORS1    & $22.91 \pm 0.09$    & $I$ 	   \\
2006 Oct. 08.77089 &  $180+300+165  $           &  2.07239  	& $0.9$      & VLT/FORS1    & $23.96 \pm 0.12$    & $R$ 	   \\
2007 Feb. 17.65358 &  $40 \times 3 \times 20$   &  133.95509	& $1.2$      & VLT/ISAAC    & $ {>}21.2$            & $K$ 	   \\
2007 Feb. 22.13000 &  $20 \times 180$           &  138.43153	& $0.6$      & VLT/FORS2    & $25.92 \pm 0.12$    & $B$ 	   \\
2007 Mar. 10.07215 &  $47 \times 3 \times 20$   &  154.37368	& $0.8$      & VLT/ISAAC    & $22.00 \pm 0.20$    & $J$ 	   \\
2007 Mar. 15.02346 &  $6  \times 180$           &  159.32499	& $0.9$      & VLT/FORS1    & $24.56 \pm 0.07$    & $V$ 	   \\
2007 Mar. 15.03891 &  $3  \times 180$           &  159.34044	& $0.9$      & VLT/FORS1    & $23.05 \pm 0.12$    & $I$ 	   \\ \hline
2006 Oct. 09.31165 &  $4 \times 2700$           &  2.613155      & $0.9$      & VLT/FORS1    & ---                 & 300V+GG375     \\ \hline
\end{tabular}}
\medskip
{Magnitudes are in the Vega system and are not corrected for Galactic absorption. Errors and upper limits are given at $1\sigma$ and $3\sigma$ confidence level respectively.}
\label{tab_log2}
\end{table}