\begin{table}%t4
\caption {\label{subset}Combined significance of 3 subsets of GRBs selected based on the
  requirements listed in Sect.~\ref{sect_stacking}.}  % using soft cuts
%\centering
\par
\begin{tabular}{lcrr}
\hline\hline
%                & \multicolumn{2}{c}{soft-cut}      & \multicolumn{2}{c}{standard-cut} \\
%                & excess & significance ($\sigma$)  & excess & significance ($\sigma$) \\
%\hline
%Sample A           & $-$132 & $-$2.48 & $-$47 & $-$1.80 \\
%Sample B           & 12 & 0.35 & 30 & 1.76 \\
%Sample C           & $-$12 & $-$0.22 & 17 & 0.57 \\
%all GRBs           & $-$138 & $-$1.78 & $-$5 & $-$0.13 \\
                & Number  & Soft-cut & Standard-cut \\
                & of GRBs & analysis & analysis \\
\hline
Sample A        & 10      &  --2.13 & --1.81 \\
Sample B        & 6       &  --0.20 & 1.45  \\
Sample C        & 11      &  --0.53 & 0.48  \\
All GRBs        & 21      &  --1.98 & --0.18 \\
\hline
\end{tabular}
\end{table}