\begin{table}%t1
 %\centering
\par
  \caption{\label{tab_sOri_GCS:log_obs}Log of the observations.}
  \begin{tabular}{c c c c }
 \hline\hline
Tile$^{a}$  &  RA  & Dec. & Date       \\
      &   h:m   &  d:'  & YYYY-MM-DD \\
 \hline
1 &  05:33   & $-$03:21 & 2005-10-05  \\
2 &  05:33   & $-$02:28 & 2005-10-14  \\
3 &  05:36   & $-$03:21 & 2005-10-13  \\
4 &  05:36   & $-$02:28 & 2005-10-06  \\
5 &  05:39   & $-$03:21 & 2005-10-13  \\
6 &  05:40   & $-$02:28 & 2005-10-14  \\
7 &  05:41   & $-$03:21 & 2005-10-06  \\
8 &  05:43   & $-$02:28 & 2005-10-10  \\
9 &  05:45   & $-$03:21 & 2005-10-10  \\
 \hline
 \end{tabular}
\end{table}