\begin{table}%t1
%\centering
\par
\caption{Log of spectroscopic observations of M31N 2005-09c.\label{tab1}}
\begin{tabular}{cccc}
\hline\hline\noalign{\smallskip}
Date &  JD  & Spectral           & Exposure  \\
     &  2~453~600.0$+$     & Range(\AA)         & time (s) \\
\hline\noalign{\smallskip}
28 Sep. 05 & 42.307  &4750--6825 & 600\\
        & 42.315  &4750--6825 &1800\\
        & 42.338  &4750--6825 &3000\\
29 Sep. 05 &  43.304 &3565--5675 &3000\\
        &  43.417 &3565--5675 &3500\\
        &  43.491 & 3565--5675&3500\\
        &  43.349 &5090--7160 &3000\\
        &  43.542 & 5090--7160 &3000\\
        &  43.260 &4750--6825&3000\\
03 Oct. 05 &47.390  &4750--6825 &3300\\
        & 47.446 &6315--8365 &3300\\
05 Oct. 05 &49.264  &3565--5675 &3600\\
        & 49.312 &3565--5675 &3600\\
        & 49.370&4750--6825 &3600\\
        & 49.414& 4750--6825 &3600\\
        & 49.471&6315--8365 &3600\\
\hline
\end{tabular}
\end{table}