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tokens: ACKNOWLEDGEMENTS The authors acknowledge contribution from the grant CTA–SKA, ‘Probing particle acceleration and gamma-ray propagation with CTA and its precursors’ (PI F. Tavecchio) of the Istituto Nazionale di Astrofisica (INAF). This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. We gratefully acknowledge financial support from the agencies and organizations listed here: http://www.cta-observatory.org/consortium_acknowledgments . This research made use of ctools, a community-developed analysis package for Imaging Air Cherenkov Telescope data. ctools is based on GammaLib, a community-developed toolbox for the high-level analysis of astronomical gamma-ray data. This research has made use of the CTA instrument response functions provided by the CTA Consortium and Observatory, see https://www.cta-observatory.org/science/cta-performance/ (version prod3b-v1) for more details. This paper has gone through internal review by the CTA Consortium.