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The thesis reports on the observation of very high energy gamma radiation from the active galactic nuclei (AGN) Mkn501, 1ES2344, PG1553, and BL Lacertae using the 17 m diameter MAGIC Cherenkov telescope. For the first time, flux variability on a time scale of minutes was observed for Mkn501, allowing the determination of a new limit on the quantum gravity energy scale. This limit is well compatible with the best limits inferred in the literature. 1ES2344 was for the first time observed in a low emission state, whose differential energy spectrum was deduced and whose properties are discussed. PG1553 and BL Lacertae were newly detected at gamma ray energies E>100 GeV. Further a comparative study of all blazar-type AGNs found at E>100 GeV is performed. The thesis also discusses the implementation of a fast repositioning system for the MAGIC telescope and the determination of differential fluxes in the MAGIC standard analysis and reconstruction software.

Measurement of Very High Energy Gamma‐Ray Emission from Four Blazars Using the MAGIC Telescope and a Comparative Blazar Study