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Because of no results crossing FR0CAT vs ( https://arxiv.org/abs/1709.00015) FL8Y List , FR0CAT has been checked against Swift SWIFT and XMM catalogs in order to have a sample where to apply apply statistic methods as Stacking analysis to detect new candidates and consequently to compare gamma-ray, X-ray and radio properties with other sources.
In FR0CAT 12 sources have been detected by SWIFT and 14 by XMM. Only 3 sources are in both the selection : SDSSJ104028.337+091057.1 / SDSSJ152151.85 / SDSSJ155951.61+255626.3 , then a master sample of 23 objects with a X-rays detection is available.
E.Torresi et al. ( https://arxiv.org/abs/1802.08581 ) studied