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PESSTO spectroscopic classification of optical transients

ATel #4336; C. Inserra (Queens University Belfast), F. Cellier-Holzem (LPHNE, Paris), M. Fraser, D. Wright, S. J. Smartt, D. R. Young, K. W. Smith (Queens University Belfast), A. Pastorello, S. Valenti, S. Benetti (INAF-Osservatorio Astronomico di Padova), S. Taubenberger (MPA), M. Sullivan (University of Oxford), A. Gal-Yam, O. Yaron, I. Arcavi (Weizmann Institute for Science), C. Baltay, N. Ellman, E. Hadjiyska, R. McKinnon, D. Rabinowitz (Yale University), U. Feindt, M. Kowalski (Universitat Bonn), P. Nugent (LBL Berkeley)
on 25 Aug 2012; 13:30 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Morgan Fraser (mfraser02@qub.ac.uk)

Subjects: Optical, Supernovae

PESSTO, the Public ESO Spectroscopic Survey for Transient Objects (see Valenti et al., ATel #4037; http://www.pessto.org ), reports the following supernova classifications. Targets were supplied by the La Silla-Quest survey (see Hadjiyska et al., ATel #3812). All observations were performed on the ESO New Technology Telescope at La Silla on 2012 August 25, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) and GELATO (Harutyunyan et al., 2008, A&A, 488, 383). Classification spectra can be obtained from http://www.pessto.org (via WISeREP).

 
Name                     | RA          | Dec         | Disc. Date | Disc. source | Disc. Mag | Redshift | Type      | Phase       | Notes   
LSQ12elq                 | 20:32:15.46 | +01:29:15.7 | 20120820   | LSQ          | 17.6      | ?        | ?         | ?           | See Note 1 
LSQ12elk                 | 02:05:19.66 | -05:58:20.3 | 20120810   | LSQ          | 20.0      | 0.12     | SN Ia	    | +0-2d       | Normal, match to 07af     

(1) LSQ12elq has a blue, largely featureless continuum. No narrow emission lines are seen; the strongest feature is an unidentified absorption at ~4100 Ang, with a width of ~65 Ang. The transient appears to have no host galaxy or stellar counterpart in the stacked La Silla Quest reference image. The transient shows several of the characteristics of the family of ultra-luminous Type Ic SNe (Quimby et al. 2011, Nature, 474, 487), although in the absence of a redshift this cannot be confirmed. Further observations with PESSTO to secure a higher S/N spectrum in the blue are ongoing.