168 citations · 474 across the 12 of their papers we have counts for
12 papers
GLITP Optical Monitoring of QSO 0957+561: VR Light Curves and Variability
Aurora Ullan, Luis J. Goicoechea, Jose A. Munoz +6
The GLITP collaboration observed the first gravitational lens system (QSO 0957+561) from 2000 February 3 to 2000 March 31. The daily VR observations were made with the 2.56-m Nordi…
Optical Continuum Sources in Gravitationally Lensed Quasars
L. J. Goicoechea, D. Alcalde, V. N. Shalyapin
We review some techniques to study the nature and size of the optical continuum sources in multiple QSOs. We focus on the source originating the events with several months timescal…
Around the Clock Observations of the Q0957+561 A,B Gravitationally Lensed Quasar II: Results for the second observing season
Wesley N. Colley, Rudolph E. Schild, Cristina Abajas +35
We report on an observing campaign in March 2001 to monitor the brightness of the later arriving Q0957+561 B image in order to compare with the previously published brightness obse…
Determination of the properties of the central engine in microlensed QSOs
L. J. Goicoechea, D. Alcalde, E. Mediavilla +1
We study a recently observed gravitational microlensing peak in the V-band light curve of Q2237+0305A using a relatively simple, but highly consistent with the data (the best-fit r…
The nature and size of the optical continuum source in QSO 2237+0305
V. N. Shalyapin, L. J. Goicoechea, D. Alcalde +3
From the peak of a gravitational microlensing high-magnification event in the A component of QSO 2237+0305, which was accurately monitored by the GLITP collaboration, we derived ne…
A Large Brightness Enhancement of the QSO 0957+561 A Component
A. Oscoz, D. Alcalde, M. Serra-Ricart +2
We report an increase of more than 0.2 mag in the optical brightness of the leading image (A) of the gravitational lens Q0957+561, detected during the 09/2000 -- 06/2001 monitoring…