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We present observations of the intranight brightness variability of CR Boo, amember of the AM CVn stars group. The observational data are obtained with the2m telescope of the Rozhen National Astronomical Observatory and the 60 cmtelescope of the Belogradchik Observatory, Bulgaria, in BVR bands. We reportthe appearance of superhumps, with an amplitude from 0.08 to 0.25 mag, when themaximum brightness reaches the magnitude 14.08 in the V band, and 14.13 in theB band. A secondary maximum of each superhump is detected with the sameperiodicity as the superhumps: Psh = 24.76 - 24.92 min. In our results, thepost maxima are shifted in time from $\approx 7.62$ min to $\approx 16.35$ minin different nights, with an amplitude of $\approx 0.06 - 0.09$ mag and anamplitude difference of $\approx 0.035$ mag towards the superhumps' maximum. Wefind a correlation of the post maxima with the accretion processes at the outerside of the disc.

Post-superhumps maximum on intranight time scales of the AM CVn star CR Boo