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Elias-Rosa, P. A. Mazzali, P. Charalampopoulos, P. Lundqvist, P. Marziani, P. Ochner, R. J. Wainscoat, S. Fiscale, S. Gomez, S. J. Smartt, S. Kiyota, S. Schuldt, S. Srivastav, S. Taubenberger, S. Valenti, T. B. Lowe, T. J. L. de Boer, T. Kangas, T. L. Killestein, Y. Dong, Y.-Z. Cai, Z.-Y. Wang","submitted_at":"2025-03-29T15:29:26Z","abstract_excerpt":"We discuss the results of the spectroscopic and photometric monitoring of the type IIn supernova (SN) 2023ldh. Survey archive data show that the SN progenitor experienced some erratic outbursts in the years before exploding. From May 2023, the source shows a general slow luminosity rise lasting over four months with some superposed luminosity fluctuations. In analogy to SN 2009ip, we label this brightening as Event A. During Event A, SN 2023ldh reaches a maximum absolute magnitude of Mr = -15.52 +- 0.24 mag. 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