\begin{table}%t1
%\centering
\par
\caption{Journal of the CCD observations of QW Ser.\label{tab1}}
\begin{tabular}{lccrr}
\hline
\hline
Date of& Start & End & Length & No. of \\
2003   & 2~452~000. + & 2~452~000. + & [hr]~ & frames \\
\hline
Feb. 23/24 &694.53928 &694.68717 & 3.549 & 174\\
Feb. 24/25 &695.50857 &695.69560 & 4.489 & 197\\
Feb. 25/26 &696.55102 &696.68165 & 3.135 & 160\\
Feb. 26/27 &697.55928 &697.68020 & 2.902 & 136\\
Mar. 07/08 &706.61633 &706.66486 & 1.165 &  17\\
Mar. 24/25 &723.49079 &723.60672 & 2.782 &  28\\
Mar. 26/27 &725.46410 &725.58953 & 3.010 &  30\\
Mar. 29/30 &728.47971 &728.60005 & 2.888 &  24\\
Mar. 31/01 &730.48924 &730.59647 & 2.574 &  23\\
Apr. 24/25 &75446824 &754.58584 & 2.822 &  29\\
Apr. 25/26 &755.43301 &755.50438 & 1.713 &  21\\
Apr. 29/30 &759.46412 &759.47453 & 0.250 &   3\\
May  03/04 &763.43619 &763.53926 & 2.473 &  23\\
May  04/05 &764.41933 &764.53249 & 2716 &  31\\
Total          &   --   & -- & 36.468 & 896 \\ 
\hline
\end{tabular}
\end{table}