\begin{table}%t1 
\caption{\label{tab_Xdata}Description of the set of \xmm\ and \chan\ observations that serendipitously detected source \candzsf. }
\small%\centerline
{
\begin{tabular}{l c c c c c c c l c} 
\hline\hline
 OBSID & Observation Date & Detector & Filter & $t_{\rm exp}$ & $\theta$ & $t_{\rm eff}$ & Counts & Rate & Near Gap?\\
       &                  &          &        & (ks)      & (arcmin) & (ks)      &        & (10$^{-2}$~s$^{-1}$) & \\
\hline
 112580601 & 2000-07-26 & pn & thick  & 27.7 & 9.7  &  15.0 & 558  & $3.73\pm0.18$ & yes\\
           &            & M1 & thick  & 33.2 & 8.7  &  17.8 & 244  & $1.37\pm0.10$ & no \\   
           &            & M2 & thick  & 30.1 & 9.1  &  15.7 & 198  & $1.26\pm0.10$ & yes\\
 112580701 & 2000-07-27 & pn & thick  & 8.0  & 9.7  &   4.3 & 161  & $3.7\pm0.3  $ & yes\\
           &            & M1 & thick  & 10.9 & 8.7  &   5.9 &  88  & $1.50\pm0.19$ & no \\
           &            & M2 & thick  & 7.9  & 9.1  &   4.1 &  41  & $1.00\pm0.18$ & yes\\
 112560101 & 2001-06-25 & pn & thick  & 21.5 & 15.8 &   6.7 & 291  & $4.4\pm0.3  $ & yes\\
 112560201 & 2001-06-28 & pn & thick  & 20.5 & 15.9 &   6.3 & 200  & $3.2\pm0.3  $ & yes\\
 145740101 & 2003-01-25 & M1 & thick  & 6.9  & 8.3  &   4.6 &  78  & $1.68\pm0.22$ & yes\\
 145740201 & 2003-01-27 & M1 & thick  & 6.9  & 8.3  &   4.6 &  73  & $1.59\pm0.21$ & yes\\
           &            & M2 & thick  & 6.9  & 8.0  &   4.8 &  69  & $1.44\pm0.20$ & yes\\
 145740301 & 2003-01-27 & M1 & thick  & 6.8  & 8.3  &   4.5 &  59  & $1.30\pm0.20$ & yes\\
           &            & M2 & thick  & 6.8  & 8.0  &   4.7 &  68  & $1.44\pm0.19$ & yes\\
 145740501 & 2003-01-29 & M2 & thick  & 6.9  & 7.9  &   4.8 &  67  & $1.41\pm0.19$ & yes\\
 160160101 & 2003-06-08 & M1 & thick  & 16.5 & 8.5  &   8.8 & 127  & $1.44\pm0.15$ & yes\\
           &            & M2 & thick  & 15.5 & 8.2  &   8.6 & 114  & $1.33\pm0.15$ & no \\
 160160901 & 2003-06-13 & M1 & thick  & 31.1 & 8.5  &  16.6 & 207  & $1.25\pm0.10$ & no \\
           &            & M2 & thick  & 31.1 & 8.3  &  17.1 & 217  & $1.27\pm0.10$ & no \\
 145780101 & 2003-07-22 & M1 & thick  & 8.4  & 9.4  &   4.6 &  76  & $1.66\pm0.21$ & no \\
 160560101 & 2003-08-02 & M2 & medium & 11.8 & 9.1  &   6.3 & 121  & $1.93\pm0.19$ & no \\
 160560201 & 2003-08-09 & M1 & thick  & 12.2 & 8.6  &   6.8 & 105  & $1.54\pm0.17$ & no \\
           &            & M2 & medium & 12.1 & 9.1  &   6.4 &  96  & $1.50\pm0.18$ & no \\
 160560301 & 2003-08-18 & M1 & thick  & 18.5 & 8.6  &  10.8 & 155  & $1.42\pm0.13$ & no \\
           &            & M2 & medium & 18.5 & 9.4  &  10.0 & 160  & $1.60\pm0.14$ & no \\
 206010101 & 2004-12-07 & pn & medium & 19.3 & 17.3 &   5.8 & 366  & $6.3\pm0.4  $ & no \\
 311990101 & 2006-01-31 & pn & thick  & 24.3 & 7.7  &  15.9 & 837  & $5.27\pm0.26$ & no \\	
           &            & M2 & thick  & 65.3 & 8.2  &  44.2 & 731  & $1.65\pm0.15$ & no \\
 9488      & 2008-09-05 & ACIS-I & OBF & 60.0 & 6.7 & 57.0  & 567  & $0.95\pm0.04$ & no \\
\hline
\end{tabular}}
\smallskip
Note: the exposure times ($t_{\rm exp}$), filtered for background flares, and the effective exposures ($t_{\rm eff}$) on \candzsf, accounting for vignetting, are reported; $\theta$ is the source off-axis angle. Net source photons and the on-axis count rates are in the 0.15$-$3~keV (\xmm) and 0.5$-$3~keV (\chan) energy bands.
\end{table}