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The Gravitational Wave event GW170817 was the result of a neutron
star--neutron star merger. Dobie et al. have presented a series of
2–9 GHz radio observations of GW170817 covering the period 125–200
days post-merger, taken with the Australia Telescope Compact Array and
the Karl G. Jansky Very Large Array. The observations demonstrate
that the radio afterglow peaked at 149 +/- 2 days post-merger and is
now declining in flux density. No evidence was seen for evolution in
the radio-only spectral index, which remains consistent with
optically-thin synchrotron emission connecting the radio, optical, and
X-ray regimes. Full details are given
in the
paper published in the Astrophysical Journal.
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