  We investigate the collision energy dependence of shear viscosity over the
entropy density ratio $\eta/s$ in Au+Au collisions at $\sqrt{s_{NN}}=19.6, 39$,
and $62.4$ GeV, using Bayesian statistical analysis and Gaussian process
emulators to explore the full input parameter space of a
transport+hydrodynamics hybrid model. The ratio is found to decrease as a
function of collision energy, supporting the results from previous studies
performed with the same hybrid model.
