J/ApJ/872/198ivo://CDS.VizieR/J/ApJ/872/198doi:10.26093/cds/vizier.18720198CDSvan Velzen S.Gezari S.Cenko S.B.Kara E.Miller-Jones J.C.A.Hung T.,Bright J.Roth N.Blagorodnova N.Huppenkothen D.Yan L.Ofek E.,Sollerman J.Frederick S.Ward C.Graham M.J.Fender R.Kasliwal M.M.,Canella C.Stein R.Giomi M.Brinnel V.van Santen J.Nordin J.,Bellm E.C.Dekany R.Fremling C.Golkhou V.Z.Kupfer T.Kulkarni S.R.,Laher R.R.Mahabal A.Masci F.J.Miller A.A.Neill J.D.Riddle R.,Rigault M.Rusholme B.Soumagnac M.T.Tachibana Y.2021-03-23T12:19:49Z2020-08-28T13:35:13ZCDS support team

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

cds-question@unistra.frphotometryvisible-astronomyultraviolet-photometryx-ray-sourcesWe present Zwicky Transient Facility (ZTF) observations of the tidal disruption flare AT2018zr/PS18kh reported by Holoien+ (2019ApJ...880..120H) and detected during ZTF commissioning. The ZTF light curve of the tidal disruption event (TDE) samples the rise-to-peak exceptionally well, with 50 days of g- and r-band detections before the time of maximum light. We also present our multi-wavelength follow-up observations, including the detection of a thermal (kT~100eV) X-ray source that is two orders of magnitude fainter than the contemporaneous optical/UV blackbody luminosity, and a stringent upper limit to the radio emission. We use observations of 128 known active galactic nuclei (AGNs) to assess the quality of the ZTF astrometry, finding a median host-flare distance of 0.2" for genuine nuclear flares. Using ZTF observations of variability from known AGNs and supernovae we show how these sources can be separated from TDEs. A combination of light-curve shape, color, and location in the host galaxy can be used to select a clean TDE sample from multi-band optical surveys such as ZTF or the Large Synoptic Survey Telescope.2019ApJ...872..198Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/872/198CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/hst : HST Archived Exposures Catalog (STScI, 2007)B/xmm : XMM-Newton Obs .Log (XMM-Newton Science Operation Center, 2012)VIII/76 : Leiden/Argentine/Bonn (LAB) Survey of Galactic HI (Kalberla+ 2005)VII/273 : The Half Million Quasars (HMQ) catalogue (Flesch, 2015)VII/283 : The Million Quasars (Milliquas) catalog (6.3) (Flesch, 2019)J/MNRAS/404/1639 : MILES base models & new line index system (Vazdekis+, 2010)J/MNRAS/429/3330 : AMI Galactic Plane Survey at 16GHz. I. (Perrott+, 2013)J/ApJ/793/38 : Palomar Transient Factory photometric obs. (Arcavi+, 2014)J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)J/MNRAS/446/2985 : Double-lobed radio sources catalog (van Velzen+, 2015)J/A+A/593/A68 : PTF12os & iPTF13bvn spectra & light curves (Fremling+, 2016)J/MNRAS/463/3813 : ASASSN-15oi UBVI M2W1W2 light curves (Holoien+, 2016)J/MNRAS/455/2918 : Photom. & line luminosities for ASASSN-14li (Holoien+, 2016)J/ApJ/844/46 : Transient event iPTF16fnl photometry (Blagorodnova+, 2017)J/ApJ/852/72 : LFs of tidal disruption flares (van Velzen, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/872/198https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/872/198http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/872/198https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/872/198https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/872/198http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/872/198GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapX-rayUVOpticaldefaultJ/ApJ/872/198/table2Optical/UV photometryTelObservatory (1)meta.id;instr.telcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[58099.48/58438.78] Modified Julian Date (JD-2400000.5)dtime.epochdoubleFiltFilter (U,B,V,UVW1,UVM2,UVW2, g,r)meta.id;instr.filtercharl_magLimit flag on magmeta.code.errorcharmag[17.5/22.1] Extinction corrected (AB) magnitude in Filtmagphot.magfloate_mag[0.01/0.48]? Uncertainty in magmagstat.error;phot.magfloatnullable