Profiles of outbursts Nos. 1− 4 in GK Per. a), c), e), g) The light curve in the optical band (one-day means, intensity scale). Closed circles represent the V band CCD measurements. Open circles denote the visual data. Standard deviations of brightness of the one-day means of the optical data are shown. b), d), f), h) Moving averages of intensities in the ASM/RXTE data. Standard errors of intensities are given. The points in the individual panels are connected by the lines to guide the eye. The vertical dashed lines denote the start and the end of the outburst in the optical band. See Sect. 3 for details. (This figure is available in color in the electronic edition.)
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