  We analyze archival data from Bailey and co-workers from the $Magellan$
adaptive optics system and present the first 0.9 $\mu$m detection ($z' =
20.3\pm0.4$ mag; $\Delta z'=13.0\pm0.4$ mag) of the 11 $M_\mathrm{Jup}$
circumbinary planet HD 106906AB b, as well as the 1 and 3.8 $\mu$m detections
of the debris disk around the binary. The disk has an east-west asymmetry in
length and surface brightness, especially at 3.8 $\mu$m where the disk appears
to be one-sided. The spectral energy distribution of b, when scaled to the
$K_S$-band photometry, is consistent with 1800 K atmospheric models without
significant dust reddening, unlike some young, very red, low-mass companions
such as CT Cha B and 1RXS 1609 B. Therefore, the suggested circumplanetary disk
of Kalas and co-workers might not contain much material, or might be closer to
face-on. Finally, we suggest that the widest ($a\gtrsim100$ AU) low mass ratio
($M_\mathrm{p}/M_\mathrm{\star} \equiv q\lesssim0.01$) companions may have
formed inside protoplanetary disks, but were later scattered by binary/planet
interactions. Such a scattering event may have occurred for HD 106906AB b with
its central binary star, but definitive proof at this time is elusive.
