Abstract

A test experiment on atmospheric Cherenkov light was performed to prepare for the setup of a large multimirror gamma-ray telescope. An array of four 1.5 m searchlight mirrors equipped with 5 in. photomultipliers was operated in the fast timing mode. A timing resolution of 0.73 ns rms was measured which corresponds to an angular resolution of 0.38° for vertically incident showers. The transmission factors of BG24 Schott filters were also measured for Cherenkov and night-sky lights with values of 0.64 and 0.25 respectively.

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