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We present optical lightcurves of variable stars consistent with thepositions of X-ray sources identified with the Chandra X-ray Observatory forthe Chandra Galactic Bulge Survey. Using data from the Mosaic-II instrument onthe Blanco 4m Telescope at CTIO, we gathered time-resolved photometric data ontimescales from $\sim2$ hr to 8 days over the $\frac{3}{4}$ of the X-ray surveycontaining sources from the initial GBS catalog. Among the lightcurvemorphologies we identify are flickering in interacting binaries, eclipsingsources, dwarf nova outbursts, ellipsoidal variations, long period variables,spotted stars, and flare stars. $87\%$ of X-ray sources have at least onepotential optical counterpart. $24\%$ of these candidate counterparts aredetectably variable; a much greater fraction than expected for randomlyselected field stars, which suggests that most of these variables are realcounterparts. We discuss individual sources of interest, provide variabilityinformation on candidate counterparts, and discuss the characteristics of thevariable population.

Variability of Optical Counterparts in the Chandra Galactic Bulge Survey