\begin{table}%t1
\caption{\label{table:xray}X-ray observations of \source.}
%\centerline
 {\small 
\begin{tabular}{lrrrrrr}
\hline\hline \noalign{\smallskip}
Telescope/Instrument & ObsID & Exp. time$^a$ & Start date & Offset$^b$ & Count rate & $L_{0.2{-}1.0}$ $^c$\\
& & [ks] & [UT] & [d] & [ct~s$^{-1}$] & [erg~s$^{-1}$]\\
\hline \noalign{\smallskip}
\chandra HRC-I & 8526 & 19.9 & 2007--11--07.64 & 5.89 & $<$8.7~\tpower{-4} & $<$4.0~\tpower{36}\\
\chandra HRC-I & 8527 & 20.0 & 2007--11--17.76 & 16.01 & ($17.4 \pm 1.1$) \tpower{-3} &  ($8.1 \pm 0.5$) \tpower{37}\\
 \chandra HRC-I & 8528 & 20.0 & 2007--11--28.79 & 27.04 & ($4.3 \pm 0.5$) \tpower{-3} &  ($2.0 \pm 0.2$) \tpower{37} \\
\chandra HRC-I & 8529 & 18.9 & 2007--12--07.57 & 35.82 & ($4.7 \pm 0.5$) \tpower{-3} &  ($2.2 \pm 0.2$) \tpower{37}\\
\chandra HRC-I & 8530 & 19.9 & 2007--12--17.49 & 45.29 & ($3.0 \pm 0.4$) \tpower{-3} &  ($1.4 \pm 0.2$) \tpower{37}\\
\xmm EPIC PN & 0505720201 & 22.2 & 2007--12--29.57 & 57.80 & $<$8.7 \tpower{-4} &  $<$2.7\tpower{35}\\ \xmm EPIC PN & 0505720301 & 21.9 & 2008--01--08.29 & 67.53 & $<$3.0 \tpower{-3} &  $<$5.4 \tpower{35}\\ 
\xmm EPIC PN & 0505720401 & 18.1 & 2008--01--18.63 & 77.87 & $<$2.2 \tpower{-3} &  $<$6.0 \tpower{35}\\ 
 \xmm EPIC PN & 0505720501 & 17.2 & 2008--01--27.94 & 87.17 & $<$2.0 \tpower{-3} &  $<$1.3 \tpower{36}\\ 
 \xmm EPIC PN & 0505720601 & 17.3 & 2008--02--07.20 & 97.44 & $<$4.3 \tpower{-3} &  $<$4.2 \tpower{35}\\ 
\noalign{\smallskip}
\hline
\end{tabular}}
\medskip
Notes:  $^a$ dead-time corrected; $^b $~time in days after the outburst of nova \nova\ in the optical \citep{2007ATel.1257....1P} on 2007 Nov. 2.28~UT  (MJD~=~54406.2); uncertainties are 0.45~days, according to Sect.~\ref{sec:results}; $^c$ X-ray luminosities and 3$\sigma$ upper limits (unabsorbed, 0.2--1.0~keV) estimated using a blackbody model with $kT$~=~50~eV and \nh = 6.7~\hcm{20} (see Sect.~\ref{sec:obs_xray}).
\end{table}