2010CBET.2390....1F

G. Folatelli and C. Gutierrez, Universidad de Chile; and G. Pignata, Universidad Andres Bello, on behalf of the Millennium Center for Supernova Science, report that they obtained optical spectrograms (range 354-886 nm) of 2010gc (cf. CBET 2367), 2010gh (cf. CBET 2372), and 2010gp (cf. CBET 2388) on July 23.0 UT with the SOAR telescope (+ Goodman HTS). SN 2010gc is a type-Ia supernova between ten days and two weeks after maximum light. Cross- correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) provides an estimated redshift of 0.06 and the best match to SN 1998bu at 12 days after maximum; adopting that redshift, the absorption minimum of the Si II 635.5-nm line for 2010gc appears blueshifted by about 9000 km/s.

SN 2010gh is a type-II-P supernova between 20 and 30 days after the explosion. SNID provides a good match with the spectrum of SN 2004et at 28 days after the explosion. Assuming a recession velocity of 4714 km/s for the host galaxy (IC 4523; Peterson 1986, PASP 98, 1273), H-alpha is measured to be blueshifted by roughly 8000 km/s.

SN 2010gp is a type-Ia supernova with high expansion velocity around maximum light. SNID provides good matches to SN 2002bo and to SN 1981B just before maximum light. Adoping the recession velocity of 7339 km/s for the host galaxy (NGC 6240; Downes et al. 1993, Ap.J. 414, L13), the Si II 635.5-nm line apears blueshifted by about 14000 km/s.