2011CBET.2848....2V

S. Valenti, E. Cappellaro, S. Benetti, Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica (INAF); M. Turatto, Osservatorio Astronomico di Trieste, INAF; and A. Pastorello, Dipartimento di Astronomia, Universita di Padova, on behalf of a larger collaboration, report that a spectrogram (range 360-810 nm; resolution 2.2 nm) of PSN J07062829+7752318 = SN 2011gn was obtained on Oct. 1.05 UT with the Ekar-Copernico 1.82-m telescope (+ AFOSC). Cross-correlation with a library of supernova spectra, via the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024), shows that the best fit is with the type-Ia supernova 2003du at three weeks after maximum. With a derived redshift of 0.029, the expansion velocity measured from the minimum of Si II 635.5-nm doublet is 10000 km/s.