TY  - JOUR
A1  - Alcalde, D.
A1  - Mediavilla, E.
A1  - Moreau, O.
A1  - De Rop, Y.
A1  - Barrena, R.
A1  - Gil-Merino, Rodrigo
A1  - McLeod, B. A.
A1  - Motta, V.
A1  - Oscoz, Alejandro
A1  - Serra-Ricart, M.
T1  - QSO 2237+0305 VR light curves from Gravitational Lenses International Time Project optical monitoring
N2  - We present VR observations of QSO 2237+0305 conducted by the Gravitational Lensing International Time Project collaboration from 1999 October 1 to 2000 February 3. The observations were made with the 2.56 m Nordic Optical Telescope at Roque de los Muchachos Observatory, La Palma (Spain). The point-spread function (PSF) fitting method and an adapted version of the ISIS subtraction method have been used to derive the VR light curves of the four components (A-D) of the quasar. The mean errors range in the intervals 0.01-0.04 mag (PSF fitting) and 0.01-0.02 mag (ISIS subtraction), with the faintest component (D) having the largest uncertainties. We address the relatively good agreement between the A and D light curves derived using different filters, photometric techniques, and telescopes. The new VR light curves of component A extend the time coverage of a high-magnification microlensing peak, which was discovered by the OGLE team.
Y1  - 2002
ER  - 
TY  - JOUR
A1  - Puga, E.
A1  - Alcalde, D.
A1  - Barrena, R.
A1  - Mediavilla, E.
A1  - Motta, V.
A1  - Munoz, J. A.
A1  - Oscoz, Alejandro
A1  - Serra-Ricart, M.
A1  - Gil-Merino, Rodrigo
A1  - Goicoechea, Luis Julian
A1  - Lewis, G. f
A1  - Libbrecht, C.
A1  - Moreau, O.
A1  - Surdej, J.
A1  - Wambsganß, Joachim
T1  - Daily monitoring of the gravitational lens QSO 2237+0305 at the Nordic Optical Telescope
Y1  - 2001
SN  - 0-7923-6974-2
ER  -