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S5 0716+714 is a well-studied BL Lac object in the sky. Verifying theexistence of correlations among the flux variations in different bands servesas an important tool to investigate the emission processes. To examine thepossible existence of a lag between variations in different optical bands onthis source, we employ a discrete correlation function (DCF) analysis on thelight curves. In order to obtain statistically meaningful values for thecross-correlation time lags and their related uncertainties, we perform MonteCarlo simulations called "flux redistribution/random subset selection"(FR/RSS). Our analysis confirms that the variations in different optical lightcurves are strongly correlated. The time lags show a hint of the variations inhigh frequency band leading those in low frequency band of the order of a fewminutes.

The Correlated Multi-color Optical Variations of BL Lac Object S5 0716+714