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We present results from a search for a radio transient associated with theLIGO/Virgo source S190814bv, a likely neutron star-black hole (NSBH) merger,with the Australian Square Kilometre Array Pathfinder. We imaged a $30\,{\rmdeg}^2$ field at $\Delta T$=2, 9 and 33 days post-merger at a frequency of944\,MHz, comparing them to reference images from the Rapid ASKAP ContinuumSurvey observed 110 days prior to the event. Each epoch of our observationscovers $89\%$ of the LIGO/Virgo localisation region. We conducted an untargetedsearch for radio transients in this field, resulting in 21 candidates. For oneof these, \object[AT2019osy]{AT2019osy}, we performed multi-wavelengthfollow-up and ultimately ruled out the association with S190814bv. All othercandidates are likely unrelated variables, but we cannot conclusively rule themout. We discuss our results in the context of model predictions for radioemission from neutron star-black hole mergers and place constrains on thecircum-merger density and inclination angle of the merger. This survey issimultaneously the first large-scale radio follow-up of an NSBH merger, and themost sensitive widefield radio transients search to-date.

An ASKAP search for a radio counterpart to the first high-significance neutron star-black hole merger LIGO/Virgo S190814bv