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Classification of ASASSN-17dt/AT2017cig

ATel #10209; David Bersier (Liverpool John Moores University)
on 25 Mar 2017; 11:23 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: David Bersier (dfb@astro.livjm.ac.uk)

Subjects: Optical, Supernovae

Referred to by ATel #: 10240

We obtained a spectrum of the candidate supernova ASASSN-17dt/AT2017cig (ATEL #10199, the object is also known as ATLAS17cwo), using the SPRAT spectrograph mounted on the robotic 2m Liverpool Telescope at the Roque de los Muchachos observatory (La Palma). Observations started on 2017 Mar 24.962 (UT). The spectral range is 400-800 nm and the dispersion is 9.2 Angstrom/pixel. Classification with SNID (Blondin and Tonry 2007, ApJ, 666, 1024) indicates that this is a type Ia supernova approximately one week past maximum light at a redshift around 0.050. The best fit is with SN 2006ac 7 days past maximum light, at a redshift z=0.050. The spectrum is available on the Transient Name Server.

Liverpool Telescope