SN2018kzr: A Rapidly Declining Transient from the Destruction of a White Dwarf

Funding acknowledgments: STFC ST/P000312/1 (SJS, SAS); Alexander von Humboldt Foundation (TWC); ERC and H2020 MSC grants [615929, 725161, 758638] (AGY, CPG, KM, LG); ISF GW excellence center, IMOS, BSF Transformative program, Benoziyo Endowment Fund for the Advancement of Science, Deloro Institute, Veronika A. Rabl Physics Discretionary Fund, Paul and Tina Gardner and the WIS-CIT, Helen and Martin Kimmel Award (AGY); RAS Research Fellowship (MN), Polish NCN MAESTRO grant 2014/14/A/ST9/00121 (MG), IC120009 `Millennium Institute of Astrophysics' of the Iniciativa Cientifica Milenio del Ministerio Economia, Fomento y Turismo de Chile and CONICYT PAI/INDUSTRIA 79090016 (OR); NRF South Africa (DAHB)