\begin{table}%t1
\caption{Best fit power law spectral parameters for the \sw  and \sax ~observations of \troisc.
Numbers in parenthesis are statistical errors at the 90\% confidence level.}\label{tab.spectral_results}
%\centering
\small
\begin{tabular}{llccccc}
\hline\hline\noalign{\smallskip}
 Date     &   Instrument &$\Gamma$ & $N_{\rm{H}}$&$F_{2{-}10~\rm keV}$ & $F_{15{-}150~\rm keV}$  & $\chi^2_{\rm r}$/d.o.f.   \\
               &                       && cm$^{-2}$ &erg cm$^{-2}$ s$^{-1}$ & erg cm$^{-2}$ s$^{-1}$&  \\
               &                       & & ($10^{21}$) &($10^{-11}$) &($10^{-10}$)  & \\
               \hline
 24 April 2005 & \sw XRT &  1.76 (0.07) & 2.3 (0.4) &$6.1\pm 0.3$  && 0.99/201  \\
 11 May 2005$^{*}$  &\sw XRT &  1.62 (0.08) &2.3 (0.4)& $16 \pm 1.0$ && 0.87/172   \\
 17 May 2005 & \sw XRT &1.79  (0.10) & 2.3 (0.6)&$8.5 \pm 0.5$  && 0.92/108 \\
 19 May 2005 & \sw XRT &1.71 (0.09) & 2.4 (0.6)&$10 \pm 1.0 $ && 0.83/122 \\
\hline
8 May 2005 & \sw BAT &1.7 (0.2) & --&  &5.9 $\pm$ 1.0&0.68/57 \\
11 May 2005 & \sw BAT & -- & --&  &5.4 $\pm$ 1.3& \\
17 May 2005 & \sw BAT & -- & --&  &$<$2.3& \\
19 May 2005 & \sw BAT & -- & --&  &3.3 $\pm$ 0.6& \\
6 August 2005 & \sw BAT &1.8 (0.2) & --& & 1.7 $\pm$ 0.3& 1.47/57 \\
\hline
5 June 2000 &  \sax -LECS+MECS &1.38  (0.06) &2.4(0.8)&  $1.1\pm 0.1$&& 1.12/58  \\
\hline\noalign{\medskip}
\par
\multicolumn{5}{l} { $^{*}$ Windowed timing data.}
\end{tabular}
\par
\end{table}