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Gromadzki, M. Nicholl, M. Quilt, P. Francis, P. J. Pessi, P. M. Veres, P. Wiseman, R. Roy, R. Williams, S. J. Smartt, S. Mattila, S. R. Oates, S. Romagnoli, S. Schulze, X. Sheng","submitted_at":"2026-08-05T18:20:29Z","abstract_excerpt":"The Vera C. Rubin Observatory's Legacy Survey of Space and Time will discover unprecedented numbers of rare, long-lived optical transients, many of which will be too faint or too numerous for comprehensive spectroscopic follow-up. Characterising objects that span the boundaries between established transient classes is therefore essential for improving photometric classification. We present AT2025agpz, a luminous transient at $z=0.147$, discovered around peak by ATLAS but extensively monitored during Rubin commissioning observations of the Euclid Deep Field South. 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