2010CBET.2503....2P

G. Pignata, Universidad Andres Bello; and G. Folatelli, IPMU, University of Tokyo, on behalf of the Millennium Center for Supernova Science, report on optical spectroscopy (range 355-890 nm) of 2010iv (see above) and the object announced on CBET 2499 (and now designated 2010iu), obtained with the SOAR 4.3-m telescope (+ Goodman HTS) on Oct. 16.3 UT. The spectra show both objects to be normal type-Ia supernovae, a few days before maximum. Following cross-correlation with a library of supernova spectra using SNID (Blondin and Tonry 2007, Ap.J. 666, 1024), 2010iv is found to be most similar to SN 2003du at three days before maximum; SNID also provides a best-fit redshift of 0.074 for 2010iv. SN 2010iu is most similar to SN 1992A at five days before maximum (via SNID). The Si II 597.2-nm line appears stronger in SN 2010iu than in SN 1992A. SNID also provides a best-fit redshift of 0.040 for SN 2010iu.