J/AJ/154/42ivo://CDS.VizieR/J/AJ/154/42doi:10.26093/cds/vizier.51540042CDSHong S.Xiong D.Bai J.2017-11-13T12:54:27Z2017-10-13T12:36:24ZCDS support team

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

cds-question@unistra.frbl-lacertae-objectsinfrared-photometryvisible-astronomybroad-band-photometryWe monitored the BL Lacertae object S5 0716+714 in the optical bands during 2012 January and February with long time spans on intraday timescales (>5hr) and high time resolutions. During this monitoring period, the object shows violent flaring activity in both short and intraday timescales. The object has a high duty cycle. The light curves detected as intraday variability show variability of various shapes. The variability amplitude is from 12.81% to 33.22%, and the average value is 19.92%+/-5.87%. The overall magnitude variabilities are {Delta}B=1.24^m^, {Delta}V=1.42^m^, {Delta}R=1.3^m^, and {Delta}I=1.23^m^. During the observations, the average change rate is <CR>{=}0.035+/-0.009Mag/h during the ascent and <CR>{=}0.035+/-0.014Mag/h during the descent. However, different cases are found on certain nights. There are good interband correlations but no significant time lags for intraday and short timescales. The results of the autocorrelation function show that the variability timescales range from 0.054 to 0.134 day. Most nights show a bluer-when-brighter (BWB) chromatic trend, a weak redder-when-brighter (RWB) trend is found, and a few nights show no correlation between magnitude and color index. The BWB trend appears in short timescales. During the flare, the spectral index exhibits a clockwise loop for internights. A shock-in-jet model and the shock wave propagating along a helical path are likely to explain the variability and color index variability.2017AJ....154...42Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/154/42CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJS/229/21 : VRI monitoring of the QSO 3C 273 in 2005-2016 (Xiong+, 2017)J/ApJS/222/24 : 2010-2015 VRI LCs of BL Lac object Mrk 501 (Xiong+, 2016)J/ApJS/218/18 : 2004-2012 BVRI observations of blazar S5 0716+714 (Dai+, 2015)J/ApJ/783/83 : BVRI photometry of S5 0716+714 (Liao+, 2014)J/ApJ/768/40 : R-band and polarimetry of blazar S5 0716+71 (Larionov+, 2013)J/AJ/143/108 : B'V'R' photometry of the BL Lac object S5 0716+714 (Wu+, 2012)J/ApJ/731/118 : R-band variability in blazar S5 0716+71 (Chandra+, 2011)J/ApJS/185/511 : Optical microvariability of S5 0716+714 (Poon+, 2009)J/AJ/136/1846 : BVRI light curves of S5 0716+714 (Zhang+, 2008)J/AJ/135/1384 : R-band variability in 5 blazars (Gupta+, 2008)J/AJ/133/1599 : B'V'R' photometry of S5 0716+714 (Wu+, 2007)J/A+A/451/435 : BV(RI)c photometry of S5 0716+714 (Montagni+, 2006)J/A+A/450/39 : BVRI photometry of 8 red blazars (Gu+, 2006)J/AJ/129/1818 : Photometry of S5 0716+714 (Wu+, 2005)J/A+A/402/151 : S5 0716+714 UBVRI photometry (Raiteri+, 2003)J/A+AS/132/83 : BVRI photometry of 7 BL Lac objects (Bai+ 1998)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/AJ/154/42https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/154/42http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/154/42https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/154/42https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/154/42http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/154/42GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap2.367228618189496e-19 4.920466254354166e-19InfraredOpticaldefaultJ/AJ/154/42/table7*Results of IntraDay Variability (IDV) observations of S5 0716+714recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUniversal Time (UT) date of the observationtime.epoch;obsnullableBand[BVRI] Observed bandinstr.bandpasscharC[0.77/8.26] Value of the C-test (1)stat.valuefloat<F>[0.61/68.23] Average F-value (1)stat.fit.paramfloatFC99[1.53/2.51] The critical F-value with 99% confidence level (1)stat.fit.paramfloatFA[1/164.48] THe F-value of one-way ANalysis Of VAriance (ANOVA) (1)stat.fit.paramfloatFA99[1.98/4] The critical F-value of one-way ANalysis Of VAriance (ANOVA) with 99% confidence level (1)stat.fit.paramfloatVarVariability status (V=Variable, PV=Probable Variable, or N=Nonvariable)meta.code;src.varcharAmp[12.81/33.22]? Variability amplitude (2)%src.var.amplitudefloatnullable<mag>[12.3/14.8] Daily average magnitudemagphot.magfloatJ/AJ/154/42/table3Data of B bandrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUniversal Time (UT) date of the observationtime.epoch;obsnullableMJD[55953.6/55963] Modified Julian Date of observationdtime.epochdoubleBmag[13.65/14.9] Johnson B band magnitudemagphot.mag;em.opt.Bfloate_Bmag[0.013/0.086] The RMS uncertainty in Bmagmagstat.error;phot.mag;em.opt.BfloatJ/AJ/154/42/table4Data of V bandrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUniversal Time (UT) date of the observationtime.epoch;obsnullableMJD[55953.6/55966] Modified Julian Date of observationdtime.epochdoubleVmag[13/14.5] Johnson V band magnitudemagphot.mag;em.opt.Vfloate_Vmag[0.01/0.078] The RMS uncertainty in Vmagmagstat.error;phot.mag;em.opt.VfloatJ/AJ/154/42/table5Data of R bandrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUniversal Time (UT) date of the observationtime.epoch;obsnullableMJD[55953.6/55966] Modified Julian Date of observationdtime.epochdoubleRmag[12.64/13.95] Cousins R band magnitudemagphot.mag;em.opt.Rfloate_Rmag[0.0076/0.047] The RMS uncertainty in Rmagmagstat.error;phot.mag;em.opt.RfloatJ/AJ/154/42/table6Data of I bandrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUniversal Time (UT) date of the observationtime.epoch;obsnullableMJD[55953.6/55966] Modified Julian Date of observationdtime.epochdoubleImag[12.16/13.39] Cousins I band magnitudemagphot.mag;em.opt.Ifloate_Imag[0.0073/0.047] The RMS uncertainty in Imagmagstat.error;phot.mag;em.opt.IfloatJ/AJ/154/42/table8Results of change rateBand[BVRI] Observed bandinstr.bandpasscharMJD[55953.6/55966] Modified Julian Date (increasing/decreasing time points)dtime.epochdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUniversal Time (UT) date of the observationtime.epoch;obsnullablemag[12.16/14.89] Magnitudemagphot.magfloatCR[-0.075/0.054]? Change rate (1)mag/hsrc.var.amplitudefloatnullable