  We report a coordinated multi-band photometry of the RS Oph 2006 outburst and
highlight the emission line free y-band photometry that shows a mid-plateau
phase at y ~ 10.2 mag from day 40 to day 75 after the discovery followed by a
sharp drop of the final decline. Such mid-plateau phases are observed in other
two recurrent novae, U Sco and CI Aql, and are interpreted as a bright disk
irradiated by the white dwarf. We have calculated theoretical light curves
based on the optically thick wind theory and have reproduced the early decline,
mid-plateau phase, and final decline. The final decline is identified with the
end of steady hydrogen shell-burning, which turned out at about day 80. This
turnoff date is consistent with the end of a supersoft X-ray phase observed
with Swift. Our model suggests a white dwarf mass of 1.35 \pm 0.01 M_\sun,
which indicates that RS Oph is a progenitor of Type Ia supernovae. We strongly
recommend the y-filter observation of novae to detect both the presence of a
disk and the hydrogen burning turnoff. Observational data of y magnitudes are
provided here together with other multi-wavelength light curve data.
