The Optical Gravitational Lensing Experiment. OGLE-III Long Term Monitoring of the Gravitational Lens QSO 2237+0305

A. Udalski; M. K. Szymanski; M. Kubiak; G. Pietrzynski; I. Soszynski; K. Zebrun; O. Szewczyk; L. Wyrzykowski; K. Ulaczyk; T. Wieckowski

arXiv · astro-ph/0701300

The Optical Gravitational Lensing Experiment. OGLE-III Long Term Monitoring of the Gravitational Lens QSO 2237+0305

A. Udalski·M. K. Szymanski·M. Kubiak·G. Pietrzynski·I. Soszynski·K. Zebrun·O. Szewczyk·L. Wyrzykowski·K. Ulaczyk·T. Wieckowski

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Abstract

We present results of the long term monitoring of the gravitational lens QSO 2237+0305 conducted during the OGLE survey. Light curves of all four components of the lens obtained during the second phase of the OGLE project (OGLE-II; 1997-2000) are supplemented with the data collected in the OGLE-III phase in the observing seasons 2001-2006. Calibration procedures to tie the new OGLE-III data with already calibrated OGLE-II light curves are described. The resulting homogeneous OGLE data set is the most extensive photometric coverage of the gravitational lens QSO 2237+0305, spanning now one decade - the seasons from 1997 to 2006 - and revealing unique microlensing activity of this spectacular object. All photometric data of the gravitational lens QSO 2237+0305 collected by OGLE are available to the astronomical community from the OGLE Internet archive.

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A. Udalski, M. K. Szymanski, M. Kubiak, G. Pietrzynski, I. Soszynski, K. Zebrun, O. Szewczyk, L. Wyrzykowski, K. Ulaczyk, T. Wieckowski. 2007-01-10. The Optical Gravitational Lensing Experiment. OGLE-III Long Term Monitoring of the Gravitational Lens QSO 2237+0305. https://arxiv.org/abs/astro-ph/0701300

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