\begin{table}%t2
\caption{\label{table-magnitudes}Magnitudes of the candidate counterpart to \grs.}
\par
%\centering
\par
\begin{tabular}{ccccc}
\hline
\hline
Filter & Observation &            Apparent          &   Interstellar  &  Dereddened   \\
       & date        &            magnitude         &   extinction    &  magnitude    \\
\hline
$R$    & 1998 Mar. 26 & $22.6 \pm 0.3$\tablefootmark{a} & $6.3  \pm 0.5$  & $1.7 \pm 0.6$ \\
$I$    & 1998 Mar. 26 & $21.1 \pm 0.3$\tablefootmark{a} & $4.0  \pm 0.3$  & $2.5 \pm 0.5$ \\
$K_{\rm s}$  & 2003 Aug. 23 & $16.9 \pm 0.2$\tablefootmark{b}& $0.94 \pm 0.07$ & $1.3 \pm 0.3$ \\
\hline
 \end{tabular}
\tablefoot {\tablefoottext{a}{Magnitude retrieved from a previous work (\cite{marti-98});}  
\tablefoottext{b}{magnitude computed in the present work.} }
 \end{table}