2010CBET.2197....1G

Uday K. Gurugubelli, G. C. Anupama, D. K. Sahu, S. Arora, and P. Anto, Indian Institute of Astrophysics, Bangalore, report that a low-resolution spectrogram (range 350-920 nm) of 2010af (cf. CBET 2194), obtained on Mar. 9.9 UT with the Indian Astronomical Observatory's 2-m Himalayan Chandra Telescope (+ HFOSC), shows it to be a type-Ia supernova at about 2-3 days from maximum light. Assuming a recession velocity of 6096 km/s for the host galaxy, NGC 3172 (Emilio et. al. 1999, PASP 111, 438; via NED), the velocity corresponding to the Si II 615.0-nm line is 10200 km/s. Using the SNID code (Blondin and Tonry 2007, Ap.J. 666, 1024), the spectrum of 2010af is found to be similar to that of SN 1991bg close to maximum light.