\begin{table}%t5
\caption{\label{spectral_indices}Measurement of spectral index for each burst.}
%\centering
\small
\begin{tabular}{c c c}
\hline \hline
Burst & $\alpha$ & 1$\sigma$ error \\
number & ($S_{\nu}\propto{\nu}^{\alpha}$) & \\
\hline
1           & --9.9                 & 6.7\\
2           & --9.0                 & 9.3 \\
3           & 0.9            &  8.7 \\   
4           & --0.4             &  6.9\\      
5           &    --12.3             &  6.9 \\
\hline
\end{tabular}
\end{table}