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Spectral Classification of ASASSN-15ga in NGC4866

ATel #7333; A. S.Piascik, I. A. Steele (Liverpool JMU)
on 1 Apr 2015; 11:18 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Iain Steele (iainsteele@mac.com)

Subjects: Optical, Supernovae

ASASSN-15ga was identified by the All Sky Automated Survey for SuperNovae (ASAS-SN) (ATel #7317). The associated galaxy is NGC 4866 with z=0.0066. We conducted a spectroscopic observation of ASASSN-15ga at 2015-04-01T:01:48:16 UT. A spectrum was obtained in the visible (400-800nm) with resolution R~350, using the SPRAT spectrograph on the Liverpool Telescope. Classification using SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) indicates it is a 91bg like type Ia supernova. The closest matching spectrum is SN1999by and estimated age is 3 days pre-maximum. The expansion velocity estimated from the Si-II 635.5 nm absorption line is 10700 km/s.

Liverpool Telescope