Calibration of the Sensitivity of Imaging Atmospheric Cherenkov Telescopes using a Reference Light Source

Details Calibration of the Sensitivity of Imaging Atmospheric Cherenkov Telescopes using a Reference Light Source Calibration of the Sensitivity of Imaging Atmospheric Cherenkov Telescopes using a Reference Light Source

1997-07-28

arxiv.org/abs/astro-ph/9707304v1

Astropart.Phys. 8 (1997) 91-99

Astronomy and Astrophysics

Astrophysics

14 Pages, 5 figures, Latex, uses epsf

Scientific paper

10.1016/S0927-6505(97)00048-0

The sensitivity of an Imaging Atmospheric Cherenkov telescope is calibrated by shining, from a distant pulsed monochromatic light source, a defined photon flux onto the mirror. The light pulse is captured and reconstructed by the telescope in an identical fashion as real Cherenkov light. The intensity of the calibration light pulse is monitored via a calibrated sensor at the telescope; in order to account for the lower sensitivity of this sensor compared to the Cherenkov telescope, an attenuator is inserted in the light source between the measurements with the calibrated sensor, and with the telescope. The resulting telescope sensitivities have errors of 10%, and compare well with other estimates of the sensitivity.

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