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Classification of A Nearby, Young Type Ia Supernova from the LSQ Survey

ATel #5067; E. S. Walker (Yale), E. Hadjiyska (Yale), D. Rabinowitz (Yale), C. Baltay (Yale), N. Ellman (Yale), R. McKinnon (Yale), U. Feindt (U. Bonn), P. Nugent (LBNL/UCB), D. Wright (QUB), T.-W. Chen (QUB), S. Smartt, and A. Lawrence (U. Edinburgh)
on 15 May 2013; 21:35 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Emma Walker (emma.walker@yale.edu)

Subjects: Optical, Supernovae, Transient

We report the spectroscopic classification of an LSQ supernova (see Hadjiyska et al., ATel #3812) at the William Herschel Telescope with ISIS (range 350-900nm).

LSQ13aiz was discovered at an unfiltered magnitude of 15.8 on 12 May 2013. The target was not seen in LSQ images 2 days prior to discovery on the 10 May 2013. The transient was further observed on 14 May 2013 by CRTS (SSS130514:131515-175756) at an unfiltered magnitude of 14.7. A spectrum obtained on 14 May 2013 and fit using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, ApJ, 666, 1024), shows the transient is a young normal Type Ia supernova between two weeks prior to peak and peak luminosity with redshifts in the range 0 - 0.01. The host (ESO 576- G 017) has a measured redshift of 0.009240, giving the absolute magnitude at discovery of -17.0, supporting a phase of 14 to 10 days before maximum light.