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We present observations with the Karl G. Jansky Very Large Array (VLA) at 3GHz toward a sub-field of the XXL-North 25 deg$^{2}$ field targeting the firstsupercluster discovered in the XXL Survey. The structure has been found at aspectroscopic redshift of 0.43 and extending over $0.35\times0.1$ deg$^{2}$ onthe sky. We present the 3 GHz VLA radio continuum observations, the radiomosaic and radio source catalogue, and, perform an analysis of the superclusterin the optical and radio regimes using photometric redshifts from the CFHTLSsurvey and our new VLA data. Our 3 GHz radio mosaic has a resolution of$3.2\times1.9$ arcsec$^2$, and covers an area of $41\times41$ arcmin$^2$ withrms noise level below $\sim20 \mu$Jy beam$^{-1}$ ($\sim11\mu$Jy beam$^{-1}$ incentral $15\times15$ arcmin$^2$). We extract a catalogue of 155 radio sources$\geq6\sigma$, 8 of which are multicomponent sources, and 123 ($79\%$) can beassociated with optical sources in the CFHTLS W1 catalogue. Applying Voronoitessellation analysis (VTA) in the area around the X-ray identifiedsupercluster we identify a total of 17 overdensities at $z=0.35-0.50$, 7 ofwhich are associated with clusters detected in the $XMM-Newton$ XXL data. Wefind a mean photometric redshift of 0.43 for our overdensities, consistent withthe spectroscopic redshifts of 7 X-ray detected clusters. The fullVTA-identified structure extends over $\sim0.6\times0.2$ deg$^2$ on the sky,($\sim12\times4$ Mpc$^{2}$ at $z=0.43$). We associate 8 radio sources withpotential group/cluster member galaxies none of which are large radio galaxies.The spatial distribution of the red and blue potential group member galaxiessuggests that the clusters are dynamically young and not virialised yet, asexpected for hierarchical structure growth in a $\Lambda$CDM universe. Furtherspectroscopic data are required to analyze the dynamical state of the groups.

The XXL Survey: IX. Optical overdensity and radio continuum analysis of a supercluster at $z=0.43$