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PSN J11185695+1303494 in M65 is a young type II supernova

ATel #4909; S. Benetti, L. Tomasella, A. Pastorello, E. Cappellaro, M. Turatto, P. Ochner (Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica)
on 22 Mar 2013; 23:32 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Stefano Benetti (stefano.benetti@oapd.inaf.it)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 4910

We report that low signal-to-noise optical spectroscopy of PSN J11185695+1303494 in M65 (range 370-820 nm; resolution 1.4 nm), obtained on Mar 22.84 UT with the Asiago 1.82-m Copernico Telescope (+ AFOSC) by the Service Telescope Operating Team, shows that PSN J11185695+1303494 is a young (few days after explosion) type-II supernova. The spectrum shows a red continuum with broad (FWHM about 11000 km/s) asymmetric H-alpha emission and H-beta with a P-Cygni profile. From the H-beta minimum an expansion velocity of about 8500 km/s is derived, assuming a recession velocity of 807 km/s (from RC3, de Vaucouleurs et al 1991, via NED) for M65. Since the missing detection of significant metal lines suggests an early phase for the SN, the red spectral continuum probably results from significant line of sight extinction. The Asiago classification spectra are posted at the following website URL:http://graspa.oapd.inaf.it. Classification was made via GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383) and SNID (Blondin and Tonry 2007, Ap.J. 666, 1024).