J/ApJS/192/12ivo://CDS.VizieR/J/ApJS/192/12doi:10.26093/cds/vizier.21920012CDSImpiombato D.Covino S.Treves A.Foschini L.Pian E.Tosti G.,Fugazza D.Nicastro L.Ciprini S.2017-07-05T07:00:07Z2011-04-27T11:33:38ZCDS support team

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

cds-question@unistra.frbl-lacertae-objectsinfrared-photometryvisible-astronomyphotometryactive-galactic-nucleiWe present a large collection of photometric data on the blazar PKS 0537-441 in the VRIJHK bands taken in 2004-2009. At least three flare-like episodes with months duration and >3mag amplitude are apparent. The spectral energy distribution is consistent with a power law, and no indication of a thermal component is found. We searched for short timescale variability, and an interesting event was identified in the J band, with a duration of ~25 minutes.2011ApJS..192...12Ihttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/192/12CatalogResearchIsServedByTAP VizieR generic servicerelated-toIII/157 : An Ultraviolet Atlas of Quasar and Blazar Spectra (Kinney+, 1991)J/A+A/520/A47 : Blazars in the Swift-BAT hard X-ray sky (Maselli+, 2010)J/PASJ/60/161 : Multi-wave band emission from blazars (Yi+, 2008)J/A+A/433/1163 : Spectral catalog of BeppoSAX blazars (Donato+, 2005)J/A+A/436/799 : X- and gamma-ray fluxes of {gamma}-ray-loud blazars (Fan+,J/ApJ/537/101 : Optical Study for blazars. I. (Fan+, 2000)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/192/12https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/192/12http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/192/12https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/192/12https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/192/12http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/192/12GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/ApJS/192/12/table1Photometry of PKS0537-441 from December 2004 to March 2009recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Date of the observationdtime.epochdoubleExpExposure timestime.duration;obs.exposureintFilt[JHKVRI] Filter used in the observationinstr.setup;obscharmagObserved magnitude in Filtmagphot.magfloate_magError in magmagstat.error;phot.magfloat