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We present the first Kepler monitoring of a strongly variable BL Lac,W2R1926+42. The light curve covers 181 days with ~0.2% errors, 30 minutesampling and >90% duty cycle, showing numerous delta I/I > 25% flares overtimescales as short as a day. The flux distribution is highly skewed andnon-Gaussian. The variability shows a strong rms-flux correlation with theclearest evidence to date for non-linearity in this relation. We introduce amethod to measure periodograms from the discrete autocorrelation function, anapproach that may be well-suited to a wide range of Kepler data. Theperiodogram is not consistent with a simple power-law, but shows a flatteningat frequencies below 7x10-5 Hz. Simple models of the power spectrum, such as abroken power law, do not produce acceptable fits, indicating that the Keplerblazar light curve requires more sophisticated mathematical and physicaldescriptions than currently in use.

Kepler observations of rapid optical variability in the BL Lac object W2R1926+42