Serendipitous decametre detection of ultra steep spectrum radio emission in Abell 655 C. Groeneveld, R. J. van Weeren, A. Botteon, R. Cassano, F. de Gasperin, E. Osinga, G. Brunetti and H. J. A. Röttgering A&A, 693 (2025) A99 Published online: 07 January 2025 DOI: 10.1051/0004-6361/202452687