Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-01-10
ActaAstron.56:293,2006
Astronomy and Astrophysics
Astrophysics
11 pages
Scientific paper
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.
Kubiak Mateo M. M.
Pietrzynski Grzegorz
Soszynski Igor
Szewczyk Olaf
Szymanski Michal K.
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