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We examine changes of the $\gamma$-ray intensity observed from the directionof the binary system PSR B1259-63/LS 2883 during campaigns around its threeperiastron passages. A simple and straightforward method is applied to thepublished data obtained with the Imaging Atmospheric Cherenkov Technique.Regardless of many issues of the detection process, the method works only withnumbers of very high energetic photons registered in the specified regions.Within the realm of this scheme, we recognized changes attributable to thevariations of the intrinsic source activity at high levels of significance.

Variability of VHE $\gamma$-ray emission from the binary PSR B1259-63/LS 2883