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We present the results of a weekly monitoring of the new black hole candidateX-ray binary MAXI J1631-472 carried out with the MeerKAT radio interferometer,the Neil Gehrels Swift Observatory, and the Monitor of All-sky X-ray Image(MAXI) instrument, during its 2018-2019 outburst. The source exhibits a numberof X-ray states, in particular both high- and low-luminosity hard statesbracketed by extended soft states. Radio flaring is observed shortly after atransition from hard/intermediate states to the soft state. This is broadly inagreement with existing empirical models, but its extended duration hints atmultiple unresolved flares and/or jet-ISM interactions. In the hard stateradio:X-ray plane, the source is revealed to be 'radio quiet' at highluminosities, but to rejoin the `standard' track at lower luminosities, anincreasingly commonly-observed pattern of behaviour.

Radio flaring and dual radio loud/quiet behaviour in the new candidate black hole X-ray binary MAXI J1631-472