J/A+A/451/435ivo://CDS.VizieR/J/A+A/451/435doi:10.26093/cds/vizier.34510435CDSMontagni F.Maselli A.Massaro E.Nesci R.Sclavi S.Maesano M.2017-06-26T11:50:44Z2006-07-15T22:31:56ZCDS support team

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

cds-question@unistra.frbl-lacertae-objectsinfrared-photometryvisible-astronomybroad-band-photometrykron-cousins-photometryWe address the topic of the intra-night optical variability of the BL Lac object S5 0716+714. To this purpose a long-term observational campaign was carried out, from 1996 to 2003, which allowed the collection of a very large data set, containing 10675 photometric measurements obtained in 102 nights. The source brightness varied in a range of about 2mag, although the majority of the observations were performed when it was in the range 13.0<R<13.75. Variability time scales were estimated from the rates of magnitude variation, which were found to have a distribution function well fitted by an exponential law with a mean value of 0.027mag/h, corresponding to an e-folding time scale of the flux {tau}_F_=37.6h. The highest rates of magnitude variation were around 0.10-0.12mag/h and lasted less than 2h. These rates were observed only when the source had an R magnitude <13.4, but this finding cannot be considered significant because of the low statistical occurrence. The distribution of {tau}_F_ has a well-defined modal value at 19h. Assuming the recent estimate of the beaming factor {delta} about 20, we derived a typical size of the emitting region of about (5x10^16^)/(1+z)cm. The possibility of searching for a possible correlation between the mean magnitude variation rate and the long-term changes in the velocity of the superluminal components in the jet is discussed.2006A&A...451..435Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/451/435CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/402/151 : S5 0716+714 UBVRI photometry (Raiteri+, 2003)J/A+A/327/61 : BV(RI)c photometry of S5 0716+714 (Ghisellini+ 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/451/435https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/451/435http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/451/435https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/451/435https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/451/435http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/451/435GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/A+A/451/435/table2Log of all good quality observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_Date[*] Note on observations (1)meta.notecharJD-2449000Abridged Julian Day from the initial JD 2449000dtime.epochintObsUT start timetime.epochDurObservation Durationhtime.duration;obs.exposurefloatnNumber of framesmeta.numberintFilter[BVRI] Used filter (G1)instr.setup;instr.filterchar<mag>Mean magnitude of the sourcemagphot.magfloatrmsrms deviation (2)magstat.stdev;phot.magfloatTel[VGM] Telescope (3)meta.id;instr.telcharTITime Intervalstime.intervalintDateObservation datetime.epochnullableJ/A+A/451/435/tablea1Observed magnitudes of S5 0716+714recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsDate of observationstime.epochnullablemagMeasured magnitude of S5 0716+714magphot.magfloate_magrms uncertainty on magmagstat.error;phot.magfloatFilter[BVRI] Used filter (G1)instr.setup;instr.filterchar