\begin{table}%tA.1
\par
\caption{Calibration stars in the field of GRB~050408, as  marked in Fig.~\ref{id}.}\label{calibtab} %\centering
\small
\begin{tabular}{r c c c c c c c}
\hline\hline
\#&  RA (J2000) & Dec (J2000) &         $U $       &         $B$        &        $ V$        &         $R$        &         $I$
 \\
\hline
1 & 12:02:09.16 & +10:49:24.1 & 19.114 $\pm$ 0.053 & 19.174 $\pm$ 0.024 & 18.601 $\pm$ 0.009 & 18.213 $\pm$ 0.008 & 17.835 $\pm$ 0.024
 \\
2 & 12:02:10.38 & +10:51:37.3 & 18.982 $\pm$ 0.053 & 19.241 $\pm$ 0.024 & 18.776 $\pm$ 0.009 & 18.438 $\pm$ 0.008 & 18.062 $\pm$ 0.025
 \\
3 & 12:02:08.70 & +10:51:52.4 & 19.743 $\pm$ 0.054 & 18.759 $\pm$ 0.023 & 17.167 $\pm$ 0.008 & 16.125 $\pm$ 0.007 & 14.776 $\pm$ 0.022
 \\
4 & 12:02:14.68 & +10:54.02.8 & 18.200 $\pm$ 0.051 & 18.508 $\pm$ 0.023 & 18.028 $\pm$ 0.008 & 17.671 $\pm$ 0.007 & 17.292 $\pm$ 0.023
 \\
5 & 12:02:11.76 & +10:54:59.6 & 18.204 $\pm$ 0.051 & 17.855 $\pm$ 0.023 & 17.089 $\pm$ 0.008 & 16.627 $\pm$ 0.007 & 16.218 $\pm$ 0.022
 \\
6 & 12:02:22.95 & +10:53:57.8 & 18.896 $\pm$ 0.051 & 19.098 $\pm$ 0.023 & 18.638 $\pm$ 0.009 & 18.300 $\pm$ 0.008 & 17.980 $\pm$ 0.024
 \\
7 & 12:02:25.20 & +10:51:43.6 & 20.034 $\pm$ 0.058 & 19.143 $\pm$ 0.023 & 17.681 $\pm$ 0.008 & 16.742 $\pm$ 0.007 & 15.695 $\pm$ 0.022
 \\
8 & 12:02:24.70 & +10:49:54.7 & 17.237 $\pm$ 0.051 & 17.406 $\pm$ 0.023 & 17.020 $\pm$ 0.008 & 16.652 $\pm$ 0.007 & 16.324 $\pm$ 0.022
 \\
9 & 12:02:17.02 & +10:51:45.5 & 20.510 $\pm$ 0.064 & 20.805 $\pm$ 0.030 & 20.216 $\pm$ 0.018 & 19.673 $\pm$ 0.020 & 18.951 $\pm$ 0.041
 \\
10& 12:02:14.76 & +10:52:54.6 &        --       & 21.885 $\pm$ 0.058 & 20.528 $\pm$ 0.019 & 19.617 $\pm$ 0.014 & 18.631 $\pm$ 0.028 \\
11& 12:02:17.10 & +10:51:02.5 &        --       & 23.674 $\pm$ 0.051 & 22.376 $\pm$ 0.098 & 21.823 $\pm$ 0.092 & 20.947 $\pm$ 0.137 \\
12& 12:02:11.32 & +10:51:11.3 & 21.129 $\pm$ 0.089 & 21.249 $\pm$ 0.034 & 20.810 $\pm$ 0.023 & 20.507 $\pm$ 0.029 & 20.025 $\pm$ 0.066 \\
\hline
\end{tabular}
\end{table}