AstroNote 2020-134

We report spectral classifications of three supernovae from the Zwicky Transient Facility (Bellm et al. 2018, PASP 131, 995).   Observations were carried out in the night of 2020-07-07 using the ALFOSC spectrograph mounted on the NOT 2.56m telescope at Roque de los Muchachos Observatory, La Palma. For all observations we used Grism 4 and the 1.0 arcsecond slit. Conditions were full moon, dusty atmosphere (calima), but cloudless.   All spectra were reduced using the pypeit pipeline using SP2209+178 as standard star. Afterwards the spectra were crossmatched using SNID (Blondin & Tonry 2007 2007ApJ...666.1024B).   SN 2020gam (ZTF20aauoktk) best matches a type II supernova. It is several moths past explosion based on the ZTF light curve.    SN 2020nqw (ZTF20abixkhh) is a type Ia supernova close to maximum light.   SN 2020lid (ZTF20abjtavx, first reported as ATLAS20off) is a type Ib SN. The spectrum best matches with SN 1993J at several weeks past maximum.    We thank Teet Kuutma and the NOT staff for obtaining these service observations.