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BOKS 45906 was found to be a blue source in the Burrell-Optical-Kepler-Surveywhich showed a 3 mag outburst lasting ~5 d. We present the Kepler light curveof this source which covers nearly 3 years. We find that it is in a faintoptical state for approximately half the time and shows a series of outburstsseparated by distinct dips in flux. Using data with 1 min sampling, we findclear evidence that in its low state BOKS 45906 shows a flux variability on aperiod of 56.5574+/-0.0014 min and a semi-amplitude of ~3 percent. Since we canphase all the 1 min cadence data on a common ephemeris using this period, it isprobable that 56.56 min is the binary orbital period. Optical spectra of BOKS45906 show the presence of Balmer lines in emission indicating it is not an AMCVn (pure Helium) binary. Swift data show that it is a weak X-ray source and isweakly detected in the bluest of the UVOT filters. We conclude that BOKS 45906is a cataclysmic variable with a period shorter than the `period-bounce'systems and therefore BOKS 45906 could be the first helium-rich cataclysmicvariable detected in the Kepler field.

BOKS 45906: a CV with an orbital period of 56.6 min in the Kepler field?