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This paper is the fourth in a series of low-frequency searches fortechnosignatures. Using the Murchison Widefield Array over two nights weintegrate 7 hours of data toward the Galactic Centre (centred on the positionof Sagittarius A*) with a total field-of-view of 200 deg^2. We present atargeted search toward 144 exoplanetary systems, at our best yet angularresolution (75 arc seconds). This is the first technosignature search at afrequency of 155 MHz toward the Galactic Centre (our previous centralfrequencies have been lower). A blind search toward in excess of 3 millionstars toward the Galactic Centre and Galactic bulge is also completed, placingan equivalent isotropic power limit <1.1X10^19W at the distance to the GalacticCentre. No plausible technosignatures are detected.

A Search for Technosignatures toward the Galactic Centre at 150 MHz