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Proxima Centauri has become the subject of intense study since theradial-velocity discovery by Anglada-Escud\'e et al. 2016 of a planet orbitingthis nearby M-dwarf every ~ 11.2 days. If Proxima Centauri b transits its hoststar, independent confirmation of its existence is possible, and its mass andradius can be measured in units of the stellar host mass and radius. To date,there have been three independent claims of possible transit-like eventdetections in light curve observations obtained by the MOST satellite (in2014-15), the BSST telescope in Antarctica (in 2016), and the Las CampanasObservatory (in 2016). The claimed possible detections are tentative, due inpart to the variability intrinsic to the host star, and in the case of theground-based observations, also due to the limited duration of the light curveobservations. Here, we present preliminary results from an extensivephotometric monitoring campaign of Proxima Centauri, using telescopes aroundthe globe and spanning from 2006 to 2017, comprising a total of 329observations. Considering our data that coincide directly and/or phased withthe previously published tentative transit detections, we are unable toindependently verify those claims. We do, however, verify the previouslyreported ubiquitous and complex variability of the host star. We discusspossible interpretations of the data in light of the previous claims, and wediscuss future analyses of these data that could more definitively verify orrefute the presence of transits associated with the radial-velocity discoveredplanet.

A Multi-Year Search For Transits Of Proxima Centauri. I: Light Curves Corresponding To Published Ephemerides