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We present 2-9 GHz radio observations of GW170817 covering the period 125-200days post-merger, taken with the Australia Telescope Compact Array and the KarlG. Jansky Very Large Array. Our observations demonstrate that the radioafterglow peaked at $149\pm2$ days post-merger and is now declining in fluxdensity. We see no evidence for evolution in the radio-only spectral index,which remains consistent with optically-thin synchrotron emission connectingthe radio, optical, and X-ray regimes. The peak implies a total energy in thesynchrotron-emitting component of a ${\rm few}\times 10^{50}\,$erg. Thetemporal decay rate is most consistent with mildly- or non-relativisticmaterial and we do not see evidence for a very energetic off-axis jet, but wecannot distinguish between a lower-energy jet and more isotropic emission.

A turnover in the radio light curve of GW170817