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The early phases of the observed evolution of the supernovae (SNe) areexpected to be dominated by the shock breakout and ``flash" ionization of thesurrounding circumstellar medium. This material arises from the last stages ofthe evolution of the progenitor, such that photometry and spectroscopy of SNeat early times can place vital constraints on the latest and fastestevolutionary phases leading up to stellar death. These signatures are erased bythe expansion of the ejecta within ~5 days after explosion. Here we present theearliest constraints, to date, on the polarization of ten transients discoveredby the Zwicky Transient Facility (ZTF), between June 2018 and August 2019.Rapid polarimetric followup was conducted using the Liverpool Telescope RINGO3instrument, including 3 SNe observed within <1 day of detection by the ZTF. Thelimits on the polarization within the first 5 days of explosion, for all SNtypes, is generally <2%, implying early asymmetries are limited to axial ratios>0.65 (assuming an oblate spheroidal configuration). We also presentpolarimetric observations of the Type I Superluminous SN 2018bsz and Type II SN2018hna, observed around and after maximum light.

RINGO3 polarimetry of very young ZTF supernovae