  We present the first complete multiband observations of a binary asteroid
mutual event. We obtained high-cadence, high-signal-to-noise photometry of the
UT 2018 April 9 inferior shadowing event in the Jupiter Trojan binary system
Patroclus-Menoetius in four Sloan bands $-$ $g'$, $r'$, $i'$, and $z'$. We use
an eclipse lightcurve model to fit for a precise mid-eclipse time and estimate
the minimum separation of the two eclipsing components during the event. Our
best-fit mid-eclipse time of $2458217.80943^{+0.00057}_{-0.00050}$ is 19
minutes later than the prediction of Grundy et al. (2018); the minimum
separation between the center of Menoetius' shadow and the center of Patroclus
is $72.5\pm0.7$ km $-$ slightly larger than the predicted 69.5 km. Using the
derived lightcurves, we find no evidence for significant albedo variations or
large-scale topographic features on the Earth-facing hemisphere and limb of
Patroclus. We also apply the technique of eclipse mapping to place an upper
bound of $\sim$0.15 mag on wide-scale surface color variability across
Patroclus.
