NTT Spectroscopy Confirms MASTER PGC1375631 (Atel 3671) is a Type Ia Supernova
ATel #3711; P. Ochner, S. Valenti, S. Benetti, A. Pastorello, and L. Tomasella (INAF, Osservatorio Astronomico di Padova); and F. Bufano (INAF Osservatorio Astronomico di Catania)
on 26 Oct 2011; 08:13 UT
Credential Certification: Stefano Benetti (stefano.benetti@oapd.inaf.it)
Subjects: Optical, Supernovae
We have obtained on Oct. 18.33 UT with the New Technology Telescope (+ EFOSC2; range 360-930 nm; resolution 1.8 nm) a spectrum of the possible supernova MASTER PGC1375631, discovered on 2011/09/30.903 by MASTER robotic Net (Atel 3671). The spectrum is that of a type-Ia supernova. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) suggests a normal type-Ia supernova about 10 days after its B-band maximum at a redshift z = 0.094. The expansion velocity derived from the Si II 635.5-nm minimum is then about 10600 km/s.
