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PESSTO spectroscopic classification of optical transients

ATel #4339; A. Pastorello (INAF-Osservatorio Astronomico di Padova), C. Inserra (Queens University Belfast), F. Cellier-Holzem (LPHNE, Paris), M. Fraser, S. J. Smartt, D. Wright, D. R. Young, K. W. Smith (Queens University Belfast), S. Valenti, S. Benetti (INAF-Osservatorio Astronomico di Padova), S. Taubenberger (MPA), M. Sullivan (University of Oxford), A. Gal-Yam, O. Yaron, (Weizmann Institute for Science), B. Monard (Pretoria, South Africa), C. Baltay, N. Ellman, E. Hadjiyska, R. McKinnon, D. Rabinowitz (Yale University), U. Feindt, M. Kowalski (Universitat Bonn), P. Nugent (LBL Berkeley)
on 27 Aug 2012; 15:38 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), the Catalina Real-time Transient Survey (http://crts.caltech.edu/) and via the IAU Transient Objects Confirmation Page. All observations were performed on the ESO New Technology Telescope at La Silla on 2012 August 26, 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   
SSS120814:221352-124146  | 23 18 01.82 | -56 09 25.7 | 20120814   | CRTS         | 18.2      | 0.08     | SN Ia      | +10-12d     | Normal, match to 05kc 
PSN J21015899-4816259    | 21 01 58.99 | -48 16 25.9 | 20120819   | TOCP         | 15.6      | 0.019    | SN Ia      | +0d         | Normal, match to 02ck 
LSQ12elt                 | 20 11 07.15 | -23 08 44.5 | 20120811   | LSQ          | 19.3      | 0.10     | SN Ia      | +6-11d      | Normal, match to 89B 
LSQ12egy                 | 23 59 45.94 | -06 21 07.9 | 20120808   | LSQ          | 19.1      | 0.09?    | SN II?     | ?           | See Note 1  
PSN J23054871+1419564    | 23 05 48.71 | +14 19 56.4 | 20120821   | LOSS         | 19.2      | 0.11     | SN Ia-91T  | -8-2d       | Best match to the 91T-like SN 1999gp 
LSQ12elj                 | 02 04 08.40 | -04 49 14.5 | 20120727   | LSQ          | 21.0      | 0.09     | SN Ia      | +3 weeks    | Normal, match to 94Q 
LSQ12emi                 | 05 00 13.78 | -22 11 17.5 | 20120821   | LSQ          | 19.5      | 0.05     | SN Ic      | 0-2 weeks   | Normal, match to 94I 
PSN J02554120-2725276    | 02 55 41.20 | -27 25 27.6 | 20120822   | Monard       | 17.2      | 0.02     | SN Ia-91bg | -2-+3d      | 91bg-like, similar to 98de 

(1) LSQ12egy shows a blue continuum with several unidentified weak absorption features of intermediate width in the blue. As the transient still has a blue spectrum 20 days after discovery, a stellar variable seems unlikely. LSQ12egy is located 10" from a potential host galaxy, SDSS J235945.14-062109.9 which has a photo-z of z=0.11. If they are associated, LSQ12egy would be ~20kpc from the host with an absolute magnitude of M ~ -19. A reasonable match to the Type IIL SN 1980K was found using SNID, with an intermediate width emission feature at 7122 Ang which could be Halpha at a redshift of 0.09.