\begin{table}%t1
\caption{\label{logobstable}Log of the published values of the limiting magnitudes,
presented in the chronological order. The first column is the date
from GRB (in days). The second is the limiting $R$ magnitude of
the image. The third is the GCN~circular index of the publication. }
%\centering
\par
\begin{tabular}{c c c c}
\hline\hline\noalign{\smallskip}
Date & $R$ lim      & GCNC & Instrument \\
\noalign{\smallskip} \hline \noalign{\smallskip}
0.0000& 8  &1430 & BOOTES-1 ($D=0.06$~m) \\
0.0208& 8  &1430 & BOOTES-1 ($D=0.06$~m) \\
0.0654&18.5&1408 & TAROT ($D=0.25$~m) \\
0.0997   & 17.7  & 1406 & D. West ($D=0.20$~m)\\ 
0.1512   & 17.5  & 1404 & Super-LOTIS ($D=0.60$~m) \\
0.1831   & 18    & 1400 & NEAT ($D=1.2$~m)\\
0.1859   & 18 & 1401 &SDSS ($D=0.5$~m)  \\ 
0.1873   & 20.5  & 1405 & KAIT ($D=0.8$~m) \\
0.3790   & 18    & 1401 & SDSS ($D=0.5$~m)  \\ 
0.9017   & 24.7 &1433 & INT ($D=2.5$~m)  \\ 
1.1417   & 23.6  & 1434 & Baade ($D=6.5$~m)  \\ 
1.2352   & 20.5  & 1405 & KAIT ($D=0.8$~m)  \\ 
2.9717   &25.2  & 1433 & INT ($D=2.5$~m)  \\ 
5.4317   & 25.5  & 1434 & Subaru($D=8.2$~m)  \\ 
10.1117  & 24.0  & 1434 & Baade ($D=6.5$~m)  \\
 \hline
\end{tabular}
\end{table}