\begin{table}%t2
\caption{Log of the spectral fits of the last pulse of the prompt emission and 
of the X-ray afterglow with a photoelectrically absorbed power law.
 The energy band and exposures are the same reported in Table~\ref{t:tab1}. 
The quoted uncertainties are at~90\% confidence level.}\label{t:tab2}
%\centering
\par
\begin{tabular}{lccc}
\hline
\hline 
Observation & $N_{\rm H}$ & $\Gamma$ & $\cqr$ \\
      & (10$^{21}$ $\rcmde$)  &   &  \\
\hline
Prompt emission & [0.29]  & $\rm 2.22_{-0.25}^{+0.31}$ & 7.4/8 \\
(second pulse) \\
\hline
MECS TOO~1 & [0.29] & $\rm 2.0_{-1.1}^{+2.2}$ &  5.1/1\\
\hline
ACIS--S TOO~1 & [0.29]  & $\rm 1.5_{-0.5}^{+0.5}$   & 4.7/2 \\
\hline
\end{tabular}
\end{table}