\begin{table}%t1
%\setlength{\tabcolsep}{9pt}
\caption{Calibration stars in the GRB~021004 field, marked in Fig. 1. \label{calibtab}} 
%\centering
\par
 {
 \begin{tabular}{r c c c c}
\noalign{\smallskip} \hline\hline \noalign{\smallskip}
&$U$&$B$&$V$&$R$\\
\noalign{\smallskip} \hline \noalign{\smallskip}
1& $17.37\pm0.03$&$17.34\pm0.03$&$16.70\pm0.01$&$16.33\pm0.01$\\
2& $18.54\pm0.04$&$17.43\pm0.03$&$16.26\pm0.01$&$15.54\pm0.02$\\
3& $20.70\pm0.04$&$19.48\pm0.02$&$17.90\pm0.02$&$17.06\pm0.02$\\
4& ---&$21.12\pm0.11$&$19.74\pm0.04$&$18.78\pm0.06$\\
5& ---&$19.76\pm0.03$&$18.29\pm0.02$&$17.36\pm0.03$\\
6& $16.49\pm0.05$&$15.51\pm0.03$&$14.44\pm0.05$&$13.88\pm0.06$\\
7& $18.10\pm0.02$&$18.09\pm0.01$&$17.49\pm0.01$&$17.14\pm0.01$\\
8& $17.83\pm0.16$&$17.61\pm0.02$&$16.71\pm0.01$&$16.20\pm0.02$\\
9& $14.71\pm0.09$&$14.62\pm0.08$&$13.97\pm0.05$&$13.62\pm0.08$\\
10& $17.62\pm0.06$&$17.84\pm0.03$&$17.32\pm0.01$&$17.00\pm0.01$\\
\noalign{\smallskip} \hline\noalign{\smallskip}
&$I$&$J$&$H$&$K$\\
\noalign{\smallskip} \hline \noalign{\smallskip}
1&$15.95\pm0.02$&$15.48\pm0.07$&$15.16\pm0.10$&$14.90\pm0.14$\\
2&$14.90\pm0.03$&$14.06\pm0.03$&$13.47\pm0.03$&$13.36\pm0.05$\\
3&$16.08\pm0.05$&$15.01\pm0.04$&$14.46\pm0.06$&$14.18\pm0.08$\\
4&$17.83\pm0.06$&---&---&---\\
5&$16.46\pm0.03$&$15.41\pm0.06$&$14.72\pm0.06$&$14.44\pm0.10$\\
6&$13.39\pm0.07$&$12.56\pm0.02$&$12.07\pm0.02$&$11.95\pm0.02$\\
7&$16.79\pm0.03$&$16.33\pm0.13$&$15.84\pm0.16$&---\\
8&$15.70\pm0.03$&$14.96\pm0.04$&$14.43\pm0.05$&$14.61\pm0.11$\\
9&$13.25\pm0.09$&$12.61\pm0.02$&$12.23\pm0.02$&$12.18\pm0.02$\\
10&$16.64\pm0.02$&$16.20\pm0.11$&$15.75\pm0.14$&---\\
 \hline\end{tabular}
} 
\end{table}