TITLE:   GCN CIRCULAR
NUMBER:  27910
SUBJECT: IceCube-200530A - SN2020lam classified as SN II without evidence of CSM interaction
DATE:    20/06/09 09:56:37 GMT
FROM:    Simeon Reusch at DESY  <simeon.reusch@desy.de>

Simeon Reusch, Robert Stein, Anna Franckowiak (DESY), Jesper Sollerman,
Tassilo Schweyer and Cristina Barbarino (Stockholm University) report:

We observed ZTF candidate SN2020lam (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 6 June 2020.

We classify SN2020lam as a Type II supernova with no signatures of
interaction. Given the lack of evidence for a CSM-interaction neutrino
production scenario, SN2020lam is likely unrelated to the high-energy
IceCube neutrino IC200530A.

AT2019fdr and AT2020lls remain source candidates.