\begin{table}%t4
\caption{\label{tab:chandra}Details of the {\it Chandra} observation.}
%\centering
\small
\begin{tabular}{cc}
\hline\hline 
Observation mode  & ACIS-I, 01236 \\
Observing date & 2007 August 2 \\
Total exposure & 50.1 ks \\
Effective exposure & 49.8 ks  \\
\hline
\end{tabular}
\end{table}