\begin{table}%t3
%\centering
\par
\caption{\label{tab3}Additional archival observations used to measure the
 brightness of the \object{Abell 1689} transient, with 
HST/ACS data and those used as reference images not listed.}
\begin{tabular}{lccc}
\hline
\hline
\noalign{\smallskip}
 Date      & Exposure & Seeing & Note \\
           & [min] & [arcsec] &     \\
\hline
\noalign{\smallskip}
%\noalign{\smallskip}
\multicolumn{4}{c}{VLT/ISAAC $SZ$-band}\\
\hline
%\noalign{\smallskip}
2003 02 09$^a$  &   159 &   0.52     & transient \\
2003 04 27      &    43 &   0.43     & transient  \\
2004 01/02      &    86 &   0.55     & non-detection  \\
\hline
%\noalign{\smallskip}
\multicolumn{4}{c}{VLT/ISAAC $J$-band}\\
\hline
2003 04 12  &   132 &   0.47     & transient  \\
\hline
%\noalign{\smallskip}
\multicolumn{4}{c}{VLT/FORS2 $I$-band}\\
\hline
2003 02 06  &   36  &   0.66     & transient  \\
\hline
%\noalign{\smallskip}
\multicolumn{4}{c}{VLT/FORS2 $z$-band}\\
\hline
2003 02 09/10  &   256  &   0.60 & transient  \\
2003 02 26/27  &   324  &   0.70 & transient  \\
\hline
\end{tabular} \\
$^a$ Average of observations obtained on 5, 11 and 15 February.
\end{table}