Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-08-21
Astropart.Phys. 19 (2003) 221-233
Astronomy and Astrophysics
Astrophysics
19 pages. Accepted for publication in Astroparticle Physics
Scientific paper
10.1016/S0927-6505(02)00201-3
The atmosphere is an intrinsic part of any ground based Cherenkov gamma-ray telescope, and the telescope response is therefore sensitive to unpredictable changes in the atmospheric transparency which are difficult to measure and interpret in the absence of a calibrated beam of high energy gamma-rays. In this paper, we use the detector response to Cherenkov emission from cosmic ray initiated air showers to obtain a relative calibration for data obtained under different instrumental and atmospheric conditions as well as over a range of source angles to the Zenith. We show that such a relative calibration is useful and efficient for data selection, for correcting the measured gamma-ray rate and for inter-calibration between the elements of an array of Cherenkov telescopes.
Holder Jamie
LeBohec Steohan
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