GCN Circular 27980
Simeon Reusch, Robert Stein, Anna Franckowiak, Jannis Necker (DESY), Jesper Sollerman, Cristina Barbarino and Tassilo Schweyer (Stockholm University) report: We observed ZTF candidate SN2020lls (Reusch et al, GCN 27872), a possible counterpart to high-energy neutrino IceCube-200530A (Stein et. al, GCN 27865), using the NOT/ALFOSC spectrograph on 12 June 2020. We classify SN2020lls as a Type Ic supernova without broad-line features. SN2020lls was detected with forced photometry by ZTF in i-band images 1 day prior to neutrino detection. An explosion time estimator puts the supernova explosion time 8 (+5/-2) days prior to neutrino detection. Both points suggest that the neutrino was detected several days after explosion. �� The apparent delay between supernova explosion and neutrino detection is inconsistent with a choked-jet neutrino production scenario. Therefore, SN2020lls is likely not related to the high-energy IceCube neutrino IceCube-200530A. AT2019fdr remains a source candidate.