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The HADES experiment at GSI has recently provided data on the flowcoefficients $v_1,...,v_4$ for protons in Au+Au reactions at $E_{\rm lab} =1.23$~$A$GeV (or $\sqrt{s_\mathrm{NN}}=2.4$ GeV). This data allows to estimatethe shear viscosity over entropy ratio, $\eta/s$ at low energies via a coarsegraining analysis of the UrQMD transport simulations of the flow harmonics incomparison to the experimental data. By this we can provide for the first timean estimate of $\eta/s\approx0.65\pm0.15$ (or $(8\pm2)\,(4\pi)^{-1}$) at suchlow energies.

A first estimate of $\eta/s$ in Au+Au reactions at E$_{\rm lab}=1.23$ $A$GeV