RINGO3 polarimetry of very young ZTF supernovae. - Maund, J R; Yang, Y; Steele, I A; Baade, D; Jermak, H; Schulze, S; Bruch, R; Gal-Yam, A; Höflich, P A; Ofek, E; Wang, X; Amenouche, M; et al. (Monthly Notices of the Royal Astronomical Society, 2021)