Blazars

From the blazars included in the Roma-BZCAT catalogue, we selected 48 high-priority targets based on mutual visibility of KM3NeT and Noto tele-
scope (−34° < Dec < 55°) and the following criteria:

• A flux-density cut of F_1 GHz>1 Jy, resulting in a parent sample of 216 radio-bright blazars.
• Identification of the most promising neutrino candidates by applying beaming-based thresholds (based on MOJAVE beaming indicators; Homan et al. 2021):
  • Doppler factor D>20
  • viewing angle θ<2.5°
• Inclusion of very bright blazars with F_1 GHz>4 Jy, even if they do not strictly satisfy the above D and θ criteria, due to their high observational relevance.
• Inclusion of the two blazars TXS 0506+056 and PKS 1424+240 identified as neutrino sources from IceCube data (IceCube Collaboration 2018; Padovani et al. 2022).

Seyfert Galaxies

From the Seyfert Galaxies included in the Turin-SyCAT2 catalogue, we selected 13 high-priority Seyfert galaxies with −34° < Dec < 55° based on the following criteria:

• Seyfert galaxies with confirmed NVSS (1.4 GHz) radio counterparts and F_1 GHz>100 mJy.
• X-ray luminosity L_X≥10⁴² erg s⁻¹ from the Swift-BAT 105-month survey (Oh et al. 2018).

This sample also includes 3 Seyfert galaxies for which an excess of neutrino events has been reported by IceCube (Neronov et al. 2024).

Microquasars

We considered as high-priority observing sources all the known microquasars with −34° < Dec < 55°.