Daily Monitoring of the Gravitational Lens QSO 2237+0305 at the Nordic Optical Telescope

E Puga,David Alcalde,Rafael Barrena,Evencio Mediavilla,V Motta,J A Mua Oz,A Oscoz,Miquel Serraricart,Rodrigo Gilmerino,L J Goicoechea,Geraint F Lewis,C Libbrecht,O Moreau,Jean Surdej,Joachim Wambsganss

mag（2001）

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摘要

The quadruple lens quasar system QSO 2237+0305, the Einstein Cross, has been daily monitored in two bands (V and R) during four months within the Gravitational Lenses International Time Project at the Nordic Optical Telescope. We report on some technical aspects of the observations and the quality of the data. We have developed a photometric model for obtaining the light-curves of the four QSO components.

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gravitational lens

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