Abstract
The BL Lac objects come in two subclasses: the "low-frequency-peaked BL Lac objects" in which the synchrotron peak falls in the IR-optical range and the "high-frequency-peaked BL Lac objects" where it falls in the UV-X-ray bands. The observation results of high-frequency peaked BL Lac object: Mkn421 (z = 0.031), Mkn501 (z = 0.034), Mkn 180 (z = 0.045) and low-frequency peaked BL Lac object OJ 287 (z=0.306) are presented with integral spectra, images and spectral energy distributions combined with those in all broad energy range. Mkn 180 and OJ 287 blazars were recently detected by SHALON Cherenkov telescopic system.
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