J/A+A/540/A132ivo://CDS.VizieR/J/A+A/540/A132doi:10.26093/cds/vizier.35400132CDSShalyapin V.N.Goicoechea L.J.Gil-Merino R.2017-06-19T07:57:54Z2012-04-12T09:40:56ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frquasarsgravitational-lensingvisible-astronomysloan-photometryThe optical variability database of the two images (A and B) of the gravitationally lensed quasar Q0957+561 is based on frames taken with the Liverpool Robotic Telescope in the 2005-2010 period, as part of the Liverpool Quasar Lens Monitoring (LQLM) project (Goicoechea et al. 2010AdAst2010E..29G). A crowded-field photometry pipeline produced instrumental fluxes of both quasar images, and only frames with signal-to-noise ratio above 80 over Q0957+561A were passed through a transformation pipeline. This pipeline transformed instrumental magnitudes into SDSS magnitudes (the calibration-correction scheme is described in Appendix A of Shalyapin et al. (2008A&A...492..401S) and the main text of the paper). We also turned SDSS magnitudes into physical fluxes using suitable conversion equations (SDSS Photometric Flux Calibration 2007, http://www.sdss.org/dr7/algorithms/fluxcal.html). Table 1 contains g-band fluxes for 357 different nights, while Table 2 includes r-band fluxes for 371 observation nights.2012A&A...540A.132Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/540/A132CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/510/64 : Radio time delay of gravitational lens 0957+561 (Haarsma+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/540/A132https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/540/A132http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/540/A132https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/540/A132https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/540/A132http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/540/A132GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/540/A132/table1Fluxes in the g band (468.6nm)SBFlux of Q0957+561BmJyphot.flux.density;em.optfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Datedtime.epochdoubleSAFlux of Q0957+561AmJyphot.flux.density;em.optfloate_SAError in the flux of Q0957+561AmJystat.errorfloate_SBError in the flux of Q0957+561BmJystat.errorfloatJ/A+A/540/A132/table2Fluxes in the r band (616.5nm)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Datedtime.epochdoubleSAFlux of Q0957+561AmJyphot.flux.densityfloate_SAError in the flux of Q0957+561AmJystat.errorfloatSBFlux of Q0957+561BmJyphot.flux.densityfloate_SBError in the flux of Q0957+561BmJystat.errorfloat