Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1085..696h&link_type=abstract
HIGH ENERGY GAMMA-RAY ASTRONOMY: Proceedings of the 4th International Meeting on High Energy Gamma-Ray Astronomy. AIP Conferenc
Astronomy and Astrophysics
Astronomy
Optical Constants, Astronomical And Space-Research Instrumentation, Galactic Nuclei, Circumnuclear Matter, And Bulges
Scientific paper
We are using an optical telescope to measure the visual colors from standard stars with well known photometric properties to characterize atmospheric extinction as a function of wavelength and airmass (or zenith angle) at a certain point in time. To improve the flux and energy calibration of Cherenkov air showers recorded by IACT under varying atmospheric conditions, we investigate the correlations between the parameters characterizing the atmospheric transparency as determined by the optical telescope and the shower trigger rate measured with an IACT. This requires that the monitoring telescope is located close to the IACT to see the same part of the atmosphere.
First results from the Automatic Telescope for Optical Monitoring (ATOM), positioned four hundred meters away from the H.E.S.S. IACT telescopes, are presented here.
Hagen Hans-Juergen
Hauser Marcus
Wagner Stefan J.
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