  Given that Campaign 16 of the K2 mission is one of just two K2 campaigns
observed so far in "forward-facing" mode, which enables immediate follow-up
observations from the ground, we present a catalog of interesting targets
identified through photometry alone. Our catalog includes 30 high-quality
planet candidates (showing no signs of being non-planetary in nature), 48 more
ambiguous events that may be either planets or false positives, 164 eclipsing
binaries, and 231 other regularly periodic variable sources. We have released
light curves for all targets in C16, and have also released system parameters
and transit vetting plots for all interesting candidates identified in this
paper. Of particular interest is a candidate planet orbiting the bright F dwarf
HD 73344 (V=6.9, K=5.6) with an orbital period of 15 days. If confirmed, this
object would correspond to a $2.56 \pm 0.18 \ R_\oplus$ planet and would likely
be a favorable target for radial velocity characterization. This paper is
intended as a rapid release of planet candidates, eclipsing binaries and other
interesting periodic variables to maximize the scientific yield of this
campaign, and as a test run for the upcoming TESS mission, whose frequent data
releases call for similarly rapid candidate identification and efficient
follow-up.
