\begin{table}%t4
%\centering
\par
 \caption{\label{tab4}Swift GRBs with no measured redshifts; Part I.}
  \begin{tabular}{lrrr}
       \hline       \hline
GRB & $T_{90}$   & fluence  & peak-flux   \\
    &  s   & $10^{-7}$~erg/cm$^2$   & ph/(cm$^2$ s) \\
\hline
090201  &        83.0        &        300.00        &        14.70\\
090129        &        17.5        &        21.00        &        3.70\\
090123        &        131.0        &        29.00        &        1.70\\
090118        &        16.0        &        4.00        &        n/a\\
090113        &        9.1        &        7.60        &        2.50\\
090111        &        24.8        &        6.20        &        0.90\\
090107A        &        12.2        &        2.30        &        1.10\\
081230        &        60.7        &        8.20        &        0.70\\
081228        &        3.0        &        0.89        &        0.60\\
081226A        &        0.4        &        0.99        &        2.40\\
081221        &        34.0        &        181.00        &        18.20\\
081211A        &        3.5        &        1.30        &        0.80\\
081210        &        146.0        &        18.00        &        2.50\\
081203B        &        23.4        &        21.00        &        n/a\\
081128        &        100.0        &        23.00        &        1.30\\
081127        &        37.0        &        4.90        &        0.60\\
081126        &        54.0        &        33.00        &        3.70\\
081109A        &        190.0        &        36.00        &        1.10\\
081104        &        59.1        &        20.00        &        1.00\\
081102        &        63.0        &        23.00        &        1.40\\
081101        &        0.2        &        0.62        &        3.60\\
081025        &        23.0        &        19.00        &        1.30\\
081024A        &        1.8        &        1.20        &        1.10\\
081022        &        160.0        &        25.00        &        0.60\\
081017        &        320.0        &        14.00        &        0.07\\
081016B        &        2.6        &        0.99        &        0.50\\
081012        &        29.0        &        11.00        &        1.00\\
081011        &        9.0        &        1.60        &        0.40\\
080919        &        0.6        &        0.72        &        1.20\\
080916B        &        32.0        &        6.30        &        0.60\\
080915B        &        3.9        &        9.90        &        8.50\\
080915A        &        14.0        &        2.30        &        0.50\\
080905A        &        1.0        &        1.40        &        1.30\\
080903        &        66.0        &        14.00        &        0.80\\
080822B        &        64.0        &        1.70        &        0.06\\
080802        &        176.0        &        13.00        &        0.30\\
080727C        &        79.7        &        52.00        &        2.30\\
080727B        &        8.6        &        31.00        &        7.60\\
080727A        &        4.9        &        1.30        &        0.30\\
080725        &        120.0        &        37.00        &        2.30\\
080723A        &        17.3        &        3.30        &        0.90\\
080714        &        33.0        &        25.00        &        4.20\\
080703        &        3.4        &        2.00        &        1.00\\
080702B        &        20.0        &        5.00        &        0.50\\
080702A        &        0.5        &        0.36        &        0.70\\
080701        &        18.0        &        7.10        &        2.20\\
\hline \end{tabular} 
\end{table}