ner_tags: O O O O B-Organization O B-Grant I-Grant I-Grant O B-Grant I-Grant I-Grant B-Event I-Event B-Person O O O O O B-Grant I-Grant I-Grant O O O B-Grant O O B-Fellowship I-Fellowship I-Fellowship I-Fellowship B-Person O O O O B-Organization O B-Organization O O B-Grant I-Grant O O O O O O O O O O O O O O O
tokens: We acknowledge support from INAF under PRIN SKA/CTA FORECaST and PRIN SKA-CTA-INAF ASTRI/CTA Data Challenge. F.S. acknowledges partial support from the H2020 AHEAD project (grant agreement No. 654215) and a Leverhulme Trust Research Fellowship. E.P. acknowledges financial support from ASI and INAF under contract 2017-14-H.0 ASI-INAF. We thank the referee for the constructive comments that significantly helped to improve the paper.