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We present the analysis of hot spot brightness in light curves of theeclipsing dwarf nova IY Ursae Majoris during its normal outburst in March 2013and in quiescence in April 2012 and in October 2015. Examination of fourreconstructed light curves of the hot spot eclipses showed directly that thebrightness of the hot spot changed significantly only during the outburst. Thebrightness of the hot spot, before and after the outburst, was on the samelevel. Hereby, based on the behaviour of the hot spot, IY UMa during its normaloutburst follows the disk-instability model.

Hot spot in eclipsing dwarf nova IY Ursae Majoris during quiescence and normal outburst