BV photometry of the ultracompact binary star GP Com

We present optical B and V band photometry of GP Com - an ultracompact binary (orbital period 47 minutes) consisting of an accreting white dwarf and helium secondary
component. Our data set contains 7.7 hours observations in V band with the 2.0m telescope  and 2.9 hours simultaneous observations in B and V bands with the 1.5m telescope of the Rozhen National Astronomical  Obsevatory, Bulgaria.  The observations cover  about 13 orbital periods.