SED of SDSSJ08 constructed using archival multi-wavelength data, together with the new eROSITA (observed broad band fluxes in 0.5–2 keV and 2–10 keV), LOFAR 145 MHz, and ASKAP 888 MHz measurements. The markers show photometric points from various optical, X-ray, and radio surveys. Triangles denote upper limits. Composite SEDs from Shang et al. (2011) for radio-loud and radio-quiet quasars are fitted to the SED at z = 5.81 and corrected for absorption by the intergalactic medium (Madau & Rees 2000). SDSSJ08 does not present an X-ray excess typically observed in radio-loud quasars.