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The investigation of VHE gamma-ray sources by any methods, i ncluding mirror Cherenkov telescopes, touches on the problem of the cosmic ray origin and, a ccordingly, the role of the Galaxy in their generation. The SHALON observations have yielded t he results on Galactic supernova remnants (SNR) of different ages. Among them are: the shelltype SNRs Tycho’s SNR (1572y), Cas A (1680y), IC 443 (age ∼ (3÷ 30)× 103 y), γ Cygni SNR (age∼ (5÷ 7)× 103 y) and classical nova GK Per (Nova 1901). For each of SNRs the observ ation results are presented with spectral energy distribution by SHALON in comparison w ith other experiment data and images by SHALON together with data from X-ray by Chandra and radio-data by CGPS. The collected experimental data have confirmed the prediction o f the theory about the hadronic generation mechanism of very high energy 800 GeV 100 TeV gamma-ra ys in Tycho’s SNR, Cas A and IC443. Recently, unique data on GK Per TeV gamma-ray emissio n were obtained with SHALON experiment. The X-ray data shows that, the nova remnant of GK Per could be a younger remnant that will resemble older SNRs (like IC 443) which interact wi th molecular clouds. GK Per is supposed to be a candidate for TeV gamma-ray emission due to t h accelerated particles in the reverse shock region. The analysis of SHALON observation da ta revealed the main TeV-emission region coinciding with the position of central source of GK P er and the weak emission of shell, that is also observed in X-ray by Chandra.

The very high energy characteristics of shell-type SNRs at different ages