\begin{table}%t1
\caption{\label{datalog}\label{tab1}Observation log.}
%\centerline
{
\begin{tabular}{ccccc}
\hline\hline
GRB~   & Start time&Mode& Region$^{\$}$& Exp. time\\
       & (s)$^*$   &    &        & (s)\\
\hline
041223 & 16661	   & PC & 0, 20 & 4018 \\
050124 & 11113     & WT~& $40\times 20$ & 7351 \\
       &           & PC & 0, 20 & 11~066\\
050126 &   131     & PC & 2, 20 & 278 \\
       &           & PC & 0, 13 & 8720 \\
050128 &   108     & PC & 5, 20 & 2878 \\
       &           & PC & 0, 15 & 14~316 \\
050215b&  2100     & PC & 0, 10 & 35~563 \\
050219a&    92     & WT~& $40\times  20$ & 5003 \\
       &           & PC & 0, 20 & 2570  \\
050219b&  3130     & WT~& $40\times  20$ & 15~051 \\
       &           & PC & 0, 20 & 5724 \\
050223 &  2875     & PC & 0, 10 & 2337 \\
050306 &127390     & PC & 0, 10 & 12~284 \\
050315 &    83     & WT~& $40\times  20$ & 748  \\
       &           & PC & 7, 40 & 690 \\
       &           & PC & 0, 20 & 9642 \\
050318 &  3277     & PC & 2, 20 & 395 \\
       &           & PC & 0, 20 & 3938 \\
050319 &    87     & PC & 3, 40 & 1495 \\
       &           & PC & 0, 40 & 2511 \\
050326 &  3258     & PC & 1, 16 & 60 \\
       &           & PC & 0, 15 & 40~723\\ 
050401 &   131     & WT~& $40\times  20$ & 2292 \\
       &           & PC & 3, 20 & 276\\
       &           & PC & 0, 15 & 2079\\
050406 &    92     & WT~& $40\times  20$ & 109 \\
       &           & PC & 2, 30 & 70 \\
       &           & PC & 0, 10 & 49~050 \\  
050408 &  4653     & PC & 0, 11 & 1041 \\
       &           & PC & 0, 5  & 57~532 \\
050412 &    89     & WT~& $40\times  20$ & 168 \\ 
       &           & PC & 2, 30 & 145 \\
\hline
\end{tabular}}
\smallskip
$^*$ Time from the BAT trigger time.\\
$^{\$}$ Extraction region. In PC mode it is a circular/annular region with inner
and outer radii reported in the column. In the case of WT~mode the region is
always a $40\times20$ region along the column centered on source. 
\end{table}