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6th of January 2022
An ASKAP search for the radio counterpart of GW190814
by Dobie et al.
Dobie et al. present results from a search for the radio counterpart to the possible neutron star–black hole merger GW190814 with ASKAP. They carried out 10 epochs of observation spanning 2–655 days post-merger at a frequency of 944 MHz. Each observation covered 30 square degrees, equivalent to 87% of the event localisation. They conducted an untargeted search for radio transients in the field, as well as a targeted search for transients associated with known galaxies. They find one radio transient, ASKAP J005022.3−230349, but conclude that it is unlikely to be associated with the merger. They use their observations to place constraints on the inclination angle of the merger and the density of the surrounding environment by comparing their non-detection to model predictions for radio emission from compact binary coalescences. This survey is also the most comprehensive widefield search (in terms of sensitivity and both areal and temporal coverage) for radio transients to-date and they calculate the radio transient surface density at 944 MHz. The figure above shows ASKAP imaging of the localisation region of GW190814 at 234 (bottom right) and 260 (top left) days post-merger with both footprints outlined in grey. The 50% (dashed) and 90% (solid) contours for the initial and final gravitational wave location skymaps are shown in red and blue respectively. The paper will be published in Monthly Notices of the Royal Astronomical Society.

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