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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.
The figure above shows the light curve of a variable source
in the ASKAP field of view.
ASKAP J004545.5−265643 is outside of the 99% credible interval
for the localisation of GW190814 and so was ruled out as a
counterpart. The source has a likely counterpart in the
VLASS (Very Large Array Sky Survey) with flux density ∼500 micro-janksy
suggesting that it was brighter prior
to these observations and is therefore not a one-off transient
but rather a variable presistent radio source.
The paper will be published in Monthly Notices of the Royal Astronomical Society.
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