Accretion Disk Size Measurement and Time Delays in the Lensed Quasar WFI
  2033-4723
  We present 13 seasons of $R$-band photometry of the quadruply-lensed quasar
WFI 2033-4723 from the 1.3m SMARTS telescope at CTIO and the 1.2m Euler Swiss
Telescope at La Silla, in which we detect microlensing variability of $\sim0.2$
mags on a timescale of $\sim$6 years. Using a Bayesian Monte Carlo technique,
we analyze the microlensing signal to obtain a measurement of the size of this
system's accretion disk of $\log (r_s/{\rm cm}) = 15.86^{+0.25}_{-0.27}$ at
$\lambda_{rest} = 2481{\rm \AA}$, assuming a $60^\circ$ inclination angle. We
confirm previous measurements of the BC and AB time delays, and we obtain a
tentative measurement of the delay between the closely spaced A1 and A2 images
of $\Delta t_{A1A2} = t_{A1} - t_{A2} = -3.9^{+3.4}_{-2.2}$ days. We conclude
with an update to the Quasar Accretion Disk Size - Black Hole Mass Relation, in
which we confirm that the accretion disk size predictions from simple thin disk
theory are too small.
