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Dileptons, as an electromagnetic probe, are crucial to study the propertiesof a Quark-Gluon Plasma (QGP) created in heavy ion collisions. We calculatedthe invariant mass spectra and the anisotropic emission of thermal dielectronsfrom Au+Au collisions at the Relativistic Heavy Ion Collider (RHIC) energy$\sqrt{s_{NN}}=200$~GeV based on EPOS3. This approach provides a realistic(3+1)-dimensional event-by-event viscous hydrodynamic description of theexpanding hot and dense matter with a very particular initial condition, and alarge set of hadron data and direct photons (besides $v_{2}$ and $v_{3}$ !) canbe successfully reproduced. Thermal dilepton emission from both the QGP phaseand the hadronic gas are considered, with the emission rates based on LatticeQCD and a vector meson model, respectively. We find that the computed invariantmass spectra (thermal contribution + STAR cocktail) can reproduce the measuredones from STAR at different centralities. Different compared to other modelpredictions, the obtained elliptic flow of thermal dileptons is larger than theSTAR measurement referring to all dileptons. We observe a clear centralitydependence of thermal dilepton not only for elliptic flow $v_{2}$ but also forhigher orders. At a given centrality, $v_{n}$ of thermal dileptons decreasesmonotonically with $n$ for $2\leq n\leq5$.

Anisotropic emission of thermal dielectrons from Au+Au collisions at $\sqrt{s_{NN}}=200$~GeV with EPOS3