\begin{table}%t2
%\centering
\par
\caption{CCD BVRI broad band optical photometric observations of
the GRB~021004 afterglow. At Hanle, 2-m HCT was
used while at Nainital, 104-cm Sampurnanand optical
 telescope was used.\label{tab2}} %\scriptsize
\begin{tabular}{cccll} \hline\hline
Date (UT) & Magnitude & Exposure time& Passband & Telescope  \\
2002 December& (mag)&(s)&& \\   \hline
\par
11.9347&$22.7\pm0.14$&$2\times1200$&$B$&104-cm\\ \\
\par
11.8264&$22.3\pm0.20$&1800&$V$&104-cm\\
11.9632&$>$22.6&1800&$V$&104-cm\\ \\
\par
11.7549&$21.9\pm0.21$&2$\times$900&$R$&104-cm\\
11.7792&$21.9\pm0.16$&2$\times$900&$R$&104-cm\\
11.8640&$22.1\pm0.18$&600&$R$&HCT\\
11.8730&$22.1\pm0.18$&600&$R$&HCT\\
11.8822&$22.1\pm0.14$&600&$R$&HCT\\
11.8914&$22.4\pm0.24$&600&$R$&HCT\\
11.8993&$22.5\pm0.21$&$2\times1800$&$R$&104-cm\\
11.9318&$22.2\pm0.18$&$2\times600$&$R$&HCT\\ \\
11.8028&$>$21.4&$2\times900$&$I$&104-cm\\
\par
\hline
\end{tabular}
\end{table}