2011CBET.2868....3O

P. Ochner, S. Valenti, S. Benetti, A. Pastorello, and L. Tomasella, Istituto Nazionale di Astrofisica (INAF), Osservatorio Astronomico di Padova; and F. Bufano, INAF, Osservatorio Astronomico di Catania, on behalf of a larger collaboration, report that a spectrum of PSN J19542142-5842390 = 2011gv, obtained on Oct. 20.05 UT with the New Technology Telescope (+ EFOSC2; range 360-930 nm; resolution 1.8 nm), shows it to be a type-II supernova. The best fits to this spectrum found by GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383; publicly available at https://gelato.tng.iac.es) are with spectra of type-II- plateau supernovae a few days after explosion. The blue spectrum is dominated by a broad H-alpha, mostly in emission, while the other Balmer lines show the classical P-Cyg profile. A relatively intense line of He 587.6 nm is also present. Adopting a recessional velocity of 2138 km/s for IC 4901 (Koribalski et al. 2004, A.J. 128, 16; via NED), the expansion velocity deduced from the H-beta absorption is about 9800 km/s.