\begin{table}%t4
\caption {Spectral fit parameters from {\it Swift} and \emph{XMM-Newton} 
data analysis. The columns list the time interval over which the spectra 
were fit, the column density at the redshift of the host \textit{z}~=~3.967, the 
photon index, observed flux, unabsorbed flux, $\chi^2$ and degrees of freedom. The 
column density for the {\textit Swift/}XRT data was obtained by fitting the time 
intervals simultaneously while allowing the photon index to vary. Errors are quoted at 
the~90\% level for each parameter of interest.\label{tab4}}
%\centerline
 {\begin{tabular}{ccccccc}
\hline\hline
\noalign{\smallskip}
Time interval & Column density $N_{\rm H}$ & Power-law index & $f_{\rm obs}$ & 
$f_{\rm unabs}$ & $\chi^2$ & d.o.f. \\
(seconds since Trigger)& $\times10^{21}$ cm${-^2}$ &$\Gamma$ &
ergs cm$^{-2}$~s$^{-1}$& ergs cm$^{-2}$s$^{-1}$ &  \\\hline
\noalign{\smallskip}  
$^\ddag$132--232 & & $1.30\pm 0.07$
& $9.7\times 10^{-10}$  & $10\times 10^{-10}$ & 120 & 92\\
232--332 & $\rm 11.4^{+7.0}_{-7.0}$        & $1.7\pm0.13$   &
$4.4\times10^{-10}$ & $5.1\times 10^{-10}$ & 80.6 & 58\\
332--432 &     & $1.50\pm0.09$ &
$7.3\times 10^{-10}$ & $7.9\times 10^{-10}$ & 107.6 & 79\\\hline
432--532 &  & $\rm 1.56^{+0.10}_{-0.13}$ &
$7.3\times 10^{-10}$ & $7.7\times 10^{-10}$ & 97.9 & 84 \\
532--632 &  3.0 $^\dagger$& $1.87\pm0.06$ & $4.4\times 10^{-10}$&
$4.8\times 10^{-10}$ & 96.5 & 94      \\
632--790 &     & $1.84\pm0.05$ & $4.5\times 10^{-10}$ &
$4.9\times 10^{-10}$ & 86.7 & 95      \\\hline
%\vspace{-1em}   &      &       &       &       &       &\\
4--6.6~ks &    &       $1.60\pm{0.05}$ &
$2.2\times 10^{-10}$ & $2.4\times 10^{-10}$ & 148.6 & 148\\
        &       $\rm 12.2^{+3.5}_{-3.0}$    &               &  &  & & \\
9.7--12.4~ks & & $1.73\pm0.07$ &
$1.0\times 10^{-10}$ & $1.1\times 10^{-10}$ & 89.9 & 111    \\\hline 
15.5--23.9~ks &        &       $\rm 1.73^{+0.10}_{-0.09}$
& $2.4\times 10^{-11}$& $2.8\times 10^{-11}$ & 34.6 & 39 \\
%21.3$-$23.9~ks &       $-$&    1.95$^{+0.29}_{-0.27}$\\
27--47~ks &    $11.5\pm6.0$&   $\rm 1.84^{+0.16}_{-0.13}$ &
$4.5\times 10^{-12}$ & $4.8\times 10^{-12}$ & 34.1 & 41 \\
50--140~ks &  & $1.75\pm0.14$ & $4.8\times 10^{-13}$ &
$5.7\times 10^{-13}$ & 28 & 20 \\\hline  
\noalign{\smallskip}  
$^\S$30--56~ks & $\rm 6.7^{+1.9}_{-1.9}$ & $1.91\pm0.03$ & $3.0\times 10$$^{-12}$ & 
3.4$\times$ 10$^{-12}$ & 388.9 & 401 \\ 
30--40~ks & $\rm 7.1^{+2.4}_{-2.4}$ & $1.87\pm0.04$ & $4.1\times 10^{-12}$ & $4.6\times 10^{-12}$ & 256.9 & 302 \\ 
40--56~ks & $\rm 5.5^{+3.0}_{-3.0}$ & $1.96\pm0.04$ & $2.0\times 10^{-12}$ & $2.3\times 10^{-12}$ & 200.2 & 202 \\ \hline
\end{tabular}}
\par
\smallskip
\footnotesize{$^\ddag$ {\it Swift} epochs; $^\S$ \emph{XMM-Newton} epochs ;$^\dagger$ 99\% confidence 
Upper limit.}
\end{table}