\begin{table}%t1
\label{tab:ascaobs}
%\begin{center}
\par
  \caption{Summary of the ASCA observations of \asca. The count rates are
corrected for the vignetting.
}
    \begin{tabular}[c]{cccll}
\hline\hline
 Start date & GIS exp. &  Count rate & Off-axis \\
         (UT)         & time (ks)  & (10$^{-2}$ cts s$^{-1}$) & angle \\
\hline
 01 Sep. 1994  &  4.0  & $\phantom{1}6.3 \pm{0.7}$ &  14$'$   \\
 02 Sep. 1994  &  7.2  & $\phantom{1}7.0 \pm{1.1}$ &  21$'$   \\
 03 Sep. 1997  & 12.6  & $17.3 \pm{0.8}$ &  21$'$   \\
 \hline
\end{tabular}
%\end{center}
\par
\end{table}