\begin{table}%t1 \caption{\label{table:UJphot}Original survey and follow-up photometric observations of \secondqso.} %\centerline {\begin{tabular}{lccllr} \hline \hline Filter & Original & Follow-up & Observing date & Telescope & Exposure time \\ \hline $\iprime_\ab$ & 22.83~$\pm$~0.32 & 22.55~$\pm$~0.09 & 2008 January 8 and 12 & LT & $2 \times 1620\unit{s}$ \\ $\zprime_\ab$ & 20.13~$\pm$~0.12 & 19.99~$\pm$~0.03 & 2008 January 29 & NTT & 450\unit{s} \\ $Y_\vega$ & 19.22~$\pm$~0.06 & 19.10~$\pm$~0.03 & 2008 January 16 and 17 & UKIRT & $2 \times 300\unit{s}$ \\ $J_\vega$ & 18.69~$\pm$~0.05 & 18.76~$\pm$~0.03 & 2008 January 16 and 17 & UKIRT & $2 \times 300\unit{s}$ \\ \hline \end{tabular}} \par \smallskip All magnitudes are quoted in the natural system of the initial survey: AB for the optical SDSS bands and Vega for the NIR UKIDSS bands. Note that the transmission profile of the $\zprime_{\rm{NTT}}$ filter differs somewhat from that of the SDSS \zprime\ filter (see \sect{followup}). \end{table}