2010CBET.2222....1G

Uday K. Gurugubelli, D. K. Sahu, G. C. Anupama, and P. Anto, Indian Institute of Astrophysics, Bangalore, report that a low-resolution spectrum (range 350-750 nm) of 2010at (cf. CBET 2216), obtained on Mar. 21.88 UT with the Indian Astronomical Observatory's 2-m Himalayan Chandra Telescope (+ HFOSC), shows it to be a peculiar type-Ia supernova, a few days before maximum light. Using the SNID code of Blondin and Tonry (2007, Ap.J. 666, 1024), the spectrum of 2010at is found to best match that of SN 2000cx at about 2-3 days before maximum light. After correcting for the recession velocity of the host galaxy, MCG +13-09-10 (12537 km/s; Emilio et al. 1999, PASP 111, 438; via NED), the blueshift of the weak Si II 615.0-nm line corresponds to a velocity of 11000 km/s.