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Spectroscopy of PSN J20342262-3158236

ATel #3526; D. Milisavljevic and R. Fesen (Dartmouth College); K. Nordsieck (Univ. of Wisconsin); T. Pickering, A. Gulbis, and D. O'Donoghue (SAAO) on behalf of a larger SALT Commissioning Team
on 2 Aug 2011; 21:17 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: D. Milisavljevic (danmil@dartmouth.edu)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 3528

Low-dispersion spectra (range 320-900 nm) obtained July 29.8 UT with the 10-m SALT telescope (+ RSS) show PSN J20342262-3158236 to be a type-II supernova. Comparison with spectra retrieved from the Supernova Spectrum Archive (SUSPECT; http://bruford.nhn.ou.edu/~suspect/index.html ) show a good match to the energetic type-IIb 'hypernova' 2003bg approximately 7 days before maximum light (Hamuy et al. 2009, ApJ, 703, 1612). Assuming a redshift of z = 0.0093 for the host galaxy NGC 6925 (Koribalski et al. 2004, AJ, 128, 16), the H-alpha P-Cygni profile shows broad emission spanning 622 - 700 nm with a relatively shallow absorption minimum blueshifted around -15700 km/s.