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Spectroscopic Classification of ASASSN-15un as a Type II SN

ATel #8526; M. Seibert, B. J. Shappee (Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), Subo Dong (KIAA-PKU)
on 10 Jan 2016; 21:01 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Subo Dong (dongsubo@pku.edu.cn)

Subjects: Optical, Supernovae

We obtained a low-resolution spectrum of ASASSN-15un (ATel #8470) on UT Jan 10.1 with the du Pont 2.5m telescope (+ WFCCD) at Las Campanas Observatory. The spectrum of ASASSN-15un shows broad Balmer lines in emission (H-alpha line has FWHM ~ 12000 km/s) on top of a blue continuum, characteristic of a young Type II supernova. The first spectrum of the object obtained on UT Jan 3 by Pan et al. (ATel #8506) showed a featureless blue continuum, consistent with a Type II SN caught quite early.