  Using a global network of small telescopes, we have obtained light curves of
Proxima Centauri at 329 observation epochs from 2006 - 2017. The planet Proxima
b discovered by Anglada-Escude et al. (2016) with an orbital period of 11.186 d
has an a priori transit probability of ~1.5%; if it transits, the predicted
transit depth is about 5 millimagnitudes. In Blank et al. (2018), we analyzed
96 of our light curves that overlapped with predicted transit ephemerides from
previously published tentative transit detections, and found no evidence in our
data that would corroborate claims of transits with a period of 11.186 d. Here
we broaden our analysis, using 262 high-quality light curves from our data set
to search for any periodic transit-like events over a range of periods from 1 -
30 d. We also inject a series of simulated planet transits and find that our
data are sufficiently sensitive to have detected transits of 5 millimagnitude
depth, with recoverability ranging from ~100% for an orbital period of 1 d to
~20% for an orbital period of 20 d for the parameter spaces tested.
Specifically at the 11.186 d period and 5 millimagnitude transit depth, we rule
out transits in our data with high confidence. We are able to rule out
virtually all transits of other planets at periods shorter than 5 d and depths
greater than 3 millimagnitudes; however, we cannot confidently rule out
transits at the period of Proxima b due to incomplete orbital phase coverage
and a lack of sensitivity to transits shallower than 4 millimagnitudes.
