BOKS 45906 was found to be a blue source in the Burrell-Optical-Kepler-Survey which showed a 3 mag outburst lasting \sim 5 d. We present the \kep light curve of this source which covers nearly 3 years .
We find that it is in a faint optical state for approximately half the time and shows a series of outbursts separated by distinct dips in flux .
Using data with 1 min sampling , we find clear evidence that in its low state BOKS 45906 shows a flux variability on a period of 56.5574 \pm 0.0014 min and a semi-amplitude of \sim 3 percent .
Since we can phase all the 1 min cadence data on a common ephemeris using this period , it is probable that 56.56 min is the binary orbital period .
Optical spectra of BOKS 45906 show the presence of Balmer lines in emission indicating it is not an AM CVn ( pure Helium ) binary . Swift data show that it is a weak X-ray source and is weakly detected in the bluest of the UVOT filters .
We conclude that BOKS 45906 is a cataclysmic variable with a period shorter than the ‘ period-bounce ’ systems and therefore BOKS 45906 could be the first helium-rich cataclysmic variable detected in the \kep field .