AT 2019avd: a novel addition to the diverse population of nuclear transients A. Malyali, A. Rau, A. Merloni, K. Nandra, J. Buchner, Z. Liu, S. Gezari, J. Sollerman, B. Shappee, B. Trakhtenbrot et al. (22 more) A&A, 647 (2021) A9 Published online: 26 February 2021 DOI: 10.1051/0004-6361/202039681