\begin{table}%t2
%%\centering
\par
\caption{Offset to be added to the IJD derived by the time correlation.}
\label{bug} 
{\begin{tabular}{lc}
\hline\hline
Period (UTC)   & Offset ($\mu{\rm s}$)\\
\hline
before 2003-05-21 07:15&964 \\
from 2003-05-21 07:15 to 2003-07-03 14:23&867 \\
after 2003-07-03 14:23 &0 \\
\hline
\end{tabular}
}
\end{table}