2011CBET.2653....3G

Uday K. Gurugubelli, D. K. Sahu, G. C. Anupama, P. Anto, and S. Arora, Indian Institute of Astrophysics, Bangalore, report that a low-resolution spectrogram (range 350-930 nm) of PSN J07364263+7426348 = 2011aa, obtained on Feb. 8.87 UT with the Indian Astronomical Observatory's 2-m Himalayan Chandra Telescope (+ HFOSC), shows it to be a 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 2011aa is found to best match that of SN 1998aq at about a week before maximum light. Adopting a recession velocity of 3704 km/s for the host galaxy, UGC 3906 (de Vaucouleurs et al. 1991, Third Reference Catalogue of Bright Galaxies), the velocity corresponding to the Si II 635.5-nm absorption line is 13000 km/s.