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We present six new transits of the exoplanet OGLE-TR-111b observed with theMagellan Telescopes in Chile between April 2008 and March 2009. We combinethese new transits with five previously published transit epochs for thisplanet between 2005 and 2006 to extend the analysis of transit timingvariations reported for this system. We derive a new planetary radius value of1.019 +/- 0.026 R_J, which is intermediate to the previously reported radii of1.067 +/- 0.054 R_J (Winn et al. 2007) and 0.922 +/- 0.057 R_J (Diaz et al.2008). We also examine the transit timing variation and duration change claimsof Diaz et al. (2008). Our analysis of all eleven transit epochs does notreveal any points with deviations larger than 2 sigma, and most points are wellwithin 1 sigma. Although the transit duration nominally decreases over the fouryear span of the data, systematic errors in the photometry can account for thisresult. Therefore, there is no compelling evidence for either a timing or aduration variation in this system. Numerical integrations place an upper limitof about 1 M_E on the mass of a potential second planet in a 2:1 mean-motionresonance with OGLE-TR-111b.

Lack of Transit Timing Variations of OGLE-TR-111b: A re-analysis with six new epochs