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MAGIC is a system of two Imaging Atmospheric Cherenkov Telescopes (IACT) thatobserve Very High Energy (VHE) gamma ray sources. The PMTs in their cameras aredesigned to operate under moonlight, but they are limited to Moon phases below93% (300 Moon hours per year), as they can get damaged if the amount of lightthey receive is too high. As a result, they cannot be used in the three to fivenights around full Moon. We have selected commercial inexpensive UV-passfilters rejecting light above a wavelength of 420 nm, where the moonlightintensity is stronger. We mounted them on light-weight frames that can beeasily installed on the telescope cameras. Test observations have beenperformed during the last nine months, from which a moonlight transmission ofabout 20% and a Cherenkov light transmission of about 45% are estimated. Thisallows the observation of sources down to an angular distance of 5 degrees tothe Moon during Full Moon: essentially in the whole sky and all possiblemoonlight conditions. Therefore, the duty cycle of MAGIC can be extended byabout 30%, including nights when VHE observations with IACTs are currently notfeasible. Here we evaluate the preliminary performance, in terms of sensitivityand energy threshold, of the MAGIC telescopes equipped with the UV-pass filtersunder different moonlight intensities, as inferred from Crab Nebulaobservations and Monte Carlo simulations.

Using UV-pass filters for bright Moon observations with MAGIC