Brennan, SJ, Sollerman, J, Irani, I, Schulze, S, Chen, P, Das, KK, De, K, Fransson, C, Gal-Yam, A, Gkini, A, Hinds, KR, Lunnan, R, Perley, D, Qin, YJ, Stein, R, Wise, J, Yan, L, Zimmerman, EA, Anand, S, Bruch, RJ et al, Dekany, R, Drake, AJ, Fremling, C, Healy, B, Karambelkar, V, Kasliwal, MM, Kong, M, Kulkarni, SR, Masci, FJ, Post, RS, Purdum, J, Michael Rich, R and Wold, A (2024) Spectroscopic observations of progenitor activity 100 days before a Type Ibn supernova ⋆. Astronomy & Astrophysics, 684. ISSN 0004-6361