J/ApJS/269/60ivo://CDS.VizieR/J/ApJS/269/60doi:10.26093/cds/vizier.22690060CDSYuan Y.H.Du G.J.Fan J.H.Liu Y.Yang J.H.Ding G.Z.Pei Z.Y.2024-11-06T20:30:37Z2024-03-19T13:57:50ZCDS support team

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

cds-question@unistra.frbl-lacertae-objectsvisible-astronomysloan-photometryBL Lacertae is a key monitoring target of the 1.26m National Astronomical Observatory-Guangzhou University Infrared/Optical telescope. Within the monitored duration from 2020 September 4 to 2022 September 28, we report 13,948 observations at the g, r, and i bands (g band: 4498, r band: 4866, i band: 4584). (1) In the monitored duration, this source is located in a very bright and variable state. The maximum variabilities are {Delta}m_g_=2.013+/-0.073mag at g band, {Delta}m_r_=1.900+/-0.049mag at r band, and {Delta}m_i_=2.279+/-0.089mag at i band. (2) Among the gri intraday lightcurves, there are 104 portions of data sets displaying intraday variabilities (IDVs), with the IDV timescales ({Delta}T) being in the range of 15.84-375.84 minutes and the biggest variable value {Delta}m=0.430+/-0.041mag. (3) The distributions of {Delta}T show frequency-dependent behavior, and with the frequency increasing, {Delta}T tend to be shorter. The variable rates (V={Delta}m}/{Delta}T) from the g band are more intense than the values (V_r_) from the r band, but are more stable than the values (V_i_) from the i band. (4) On three days (2020-September-7, 2020-September-19, and 2022-September-7), we find the intraday periodic oscillations, whose periods are around 150 minutes, 232 minutes, and 150 minutes, respectively, and which might come from the source "flickering." (5) Based on the distributions between flux densities (F_gri_) and spectral indices ({alpha}), they show the bluer-when-brighter behaviors and some uneven locations, which should come from the ministructures of the jet, the shock-induced particle acceleration, or magnetic reconnection in the jet.2023ApJS..269...60Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/269/60CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/430/467 : Superluminal motions for extragal. sources (Vermeulen+, 1994)J/ApJ/833/77 : gamma-ray bright blazars optical polarization (Itoh+, 2016)J/ApJ/837/45 : 2006-2012 Rc-band & 4.8GHz obs. of AO 0235+164 (Fan+, 2017)J/ApJS/229/21 : VRI monitoring of the QSO 3C 273 in 2005-2016 (Xiong+, 2017)J/AJ/155/31 : 2005-2012 BVRI obs. of blazar S5 0716+714 (Hong+, 2018)J/A+A/620/A185 : Long-term optical monitoring of TeV Blazars (Nilsson+, 2018)J/ApJS/262/43 : NGT gri monitoring of the FSRQ 3C 454.3 (Yuan+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/269/60https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/269/60http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/269/60https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/269/60https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/269/60http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/269/60GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap2.381800341673347e-19 4.653515163505597e-19OpticaldefaultJ/ApJS/269/60/table2gri observations of BL Lacertae (1ES 2200+420)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintgJD[97.69/851.9]? Julian date of g-band observation, gJD-2459000dtime.epoch;obsfloatnullablegmag[12.6/14.7]? Observed SDSS g-band AB magnitudemagphot.mag;em.opt.Bfloatnullablee_gmag[0.005/0.2]? Uncertainty in gmagmagstat.error;phot.mag;em.opt.BfloatnullablerJD[97.69/851.9] Julian date of r-band observation, rJD-2459000dtime.epoch;obsfloatrmag[11.7/13.7] Observed SDSS r-band AB magnitudemagphot.mag;em.opt.Rfloate_rmag[0.006/0.2] Uncertainty in rmagmagstat.error;phot.mag;em.opt.RfloatiJD[97.69/851.9]? Julian date of i-band observation, iJD-2459000dtime.epoch;obsfloatnullableimag[10.7/13.1]? Observed SDSS i-band AB magnitudemagphot.mag;em.opt.Ifloatnullablee_imag[0.003/0.1]? Uncertainty in imagmagstat.error;phot.mag;em.opt.Ifloatnullable