\begin{table}%t3
\caption{\label{tab3}Best-fit parameters of the GRB~000911 afterglow light curve 
in the {\it BVRIJ}~bands, computed assuming a power law decay plus
a constant (host galaxy) contribution with and without the presence
of an underlying 1998bw-like SN occurring simultaneously with the GRB. 
Host galaxy magnitudes reported here are not corrected for Galactic 
reddening. Values within brackets are fixed in the corresponding fit.}
%\centerline
{
\begin{tabular}{ccccc}
\hline
\hline
Filter & $\alpha$ & Host galaxy magnitude & SN intensity$^a$ & 
$\chi^2$/d.o.f. \\
\hline
\multicolumn{5}{c}{Fits without SN plus free $\alpha$}\\
\hline
$B$ & $1.12 \pm 0.17$ & [26.1]  & --  & 4.2/4 \\
$V$ & $1.63 \pm 0.05$ & [25.4]  & --  & 7.3/7 \\
$R$ & $1.45 \pm 0.03$ & [25.27] & --  & 7.4/11 \\
$I$ & $1.43 \pm 0.06$ & [24.3]  & --  & 12.6/12 \\
$J$ & $0.79 \pm 0.15$ & [23.6]  & --  & 7.9/3 \\
\hline
\multicolumn{5}{c}{Fits without SN plus fixed $\alpha$}\\
\hline
$B$ & [1.48] & [26.1]  & --  & 8.3/5 \\
$V$ & [1.48] & [25.4]  & --  & 14.0/8 \\
$R$ & [1.48] & [25.27] & --  & 8.4/12 \\
$I$ & [1.48] & [24.3]  & --  & 13.2/13 \\
$J$ & [1.48] & [23.6]  & --  & 28.4/4 \\
\hline
\multicolumn{5}{c}{Fits with SN1998bw plus fixed $\alpha$}\\
\hline
$R$ & [1.48] & [25.27] &$3.5 \pm 2.0$& 5.8/11 \\
$I$ & [1.48] & [24.3]  &$3.4 \pm 1.7$& 8.8/12 \\
$J$ & [1.48] & [23.6]  &$0.9 \pm 0.3$& 3.6/3 \\
\hline
\end{tabular}}
\smallskip
 $^a$ Ratio between the SN 1998bw light peak and
that of the best-fit SN.
\end{table}