\begin{table}%t1
%\centering
\par
\caption {PdBI dual frequency observations of GRB~050730. The first three
rows refer to the 3~mm band and the last 3 rows refer to the  1~mm band.
The flux errors are
$1\sigma$. The last two columns list the beam size and position angle (PA)
respectively. \label{tab1} }
\begin{tabular}{cccccl}
\hline
\hline
Start time & End time & Freq. [GHz] & Flux [mJy] & Beam($^{\prime\prime} \times ^{\prime\prime}$) & PA ($^\circ$) \\
\hline  
2005 Aug. 2.659 & 2.816 & 102.746 & $ 2.74\pm 0.94$ & $9.2\times 5.7$ & 49 \\
2005 Aug. 5.577 & 5.838 & 105.304 & $ 1.34\pm 0.51$ & $6.9\times 6.4$ & 73 \\
2006 Jan. 5.193 & 5.356 &  86.847 & $-0.24\pm 0.27$ & $4.4\times 2.9$ & 4  \\
\hline
2005 Aug. 2.659 & 2.816 & 213.233 & $ 4.39 \pm 4.21$ & $4.8\times 2.5$ & 10 \\
2005 Aug. 5.577 & 5.838 & 214.977 & $-5.13 \pm 3.81$ & $3.8\times 2.9$ & 0  \\
2006 Jan. 5.193 & 5.356 & 230.538 & $-4.21 \pm 1.93$ & $1.7\times 1.1$ & 1  \\
\hline
\end{tabular}
\end{table}