2010CBET.2251....1B

F. Bufano, Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova (INAF-OAPd); M. Turatto, Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Catania; and S. Benetti, INAF-OAPd, on behalf of a larger collaboration, report that a spectrogram (range 350-1000 nm, resolution 1.4 nm) of 2010bp (cf. CBET 2240), obtained on April 17.12 UT with the New Technology Telescope (+ EFOSC2), shows it to be a type-Ia supernova around ten days after maximum. An expansion velocity of about 12500 km/s is measured from the minimum of the Si II 635.5-nm absorption line, after correcting for the host-galaxy recession velocity of 2911 km/s (Koribalski et al. 2004, A.J. 128, 16).