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Giant Radio Galaxies (GRGs) are the largest single structures in theUniverse. Exhibiting extended radio morphology, their projected sizes rangefrom 0.7 Mpc up to 4.9 Mpc. LOFAR has opened a new window on the discovery andinvestigation of GRGs and, despite the hundreds that are today known, theirmain growth catalyst is still debated. One natural explanation for theexceptional size of GRGs is their old age. In this context, hard X-ray selectedGRGs show evidence of restarting activity, with the giant radio lobes beingmostly disconnected from the nuclear source, if any. In this paper, we presentthe serendipitous discovery of a distant ($z=0.629$), medium X-ray selected GRGin the Bo\"otes field. High-quality, deep Chandra and LOFAR data allow a robuststudy of the connection between the nucleus and the lobes, at a larger redshiftso far inaccessible to coded-mask hard X-ray instruments. The radio morphologyof the GRG presented in this work does not show evidence for restartedactivity, and the nuclear radio core spectrum does not appear to be GPS-like.On the other hand, the X-ray properties of the new GRG are perfectly consistentwith the ones previously studied with Swift/BAT and INTEGRAL at lower redshift.In particular, the bolometric luminosity measured from the X-ray spectrum is afactor of six larger than the one derived from the radio lobes, although thelarge uncertainties make them formally consistent at $1\sigma$. Finally, themoderately dense environment around the GRG, traced by the spatial distributionof galaxies, supports recent findings that the growth of GRGs is not primarilydriven by underdense environments.

A new distant Giant Radio Galaxy in the Bo\"otes field serendipitously detected by Chandra