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PESSTO spectroscopic classification of optical transients

ATel #5934; N. Blagorodnova, H. Campbell, M. Fraser, N. Walton (IoA), J. Anderson (ESO Chile), S. Benetti, A. Pastorello (Padova), C. Inserra, S. Smartt, K. Smith, D. Young (QUB), M. Sullivan (Southampton), S. Taubenberger (MPA), S. Valenti (LCOGT), O. Yaron, A. Gal-Yam, (Weizmann), C. Knapic, R. Smareglia, M. Molinaro (Trieste), Ilan Manulis (Weizmann), C. Baltay, N. Ellman, E. Hadjiyska, R. McKinnon, D. Rabinowitz, E. S. Walker (Yale University), U. Feindt, M. Kowalski (Universitat Bonn), P. Nugent (LBL Berkeley), D. Wright, R. Kotak, (QUB), S. Valenti (LCOGT), W. Burgett, K. Chambers, M. Huber, R. P. Kudritzki, E. Magnier, J. Morgan, C. Stubbs, W. Sweeney, J. Tonry, C. Waters (IfA, Univ. Hawaii), P. Draper, N. Metcalfe (Univ. of Durham), A. Rest (STScI), L. Wyrzykowski (Warsaw Observatory, Poland)
on 28 Feb 2014; 16:41 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Morgan Fraser (mf@ast.cam.ac.uk)

Subjects: Optical, Supernovae

Referred to by ATel #: 5937, 5975

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 OGLE-IV Transient Search (ATel #4495; Wyrzykowski et al. 2012), Pan-STARRS (see Valenti et al., ATel #2668) and the Catalina Real-time Transient Survey (http://crts.caltech.edu/). All observations were performed on the ESO New Technology Telescope at La Silla on 2014 Feb 27, 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 (J2000)  | Dec (J2000) | Disc. Date | Disc. Source | Disc Mag  |  z    | Type | Phase   | Notes 
OGLE-2014-SN-022 | 04:03:27.76 | -72:11:26.9 | 20140202 | OGLE | 20.3 | 0.024 | IIn | pre-max | (1) OGLE-2014-SN-020 | 06:24:30.22 | -73:58:10.5 | 20140120 | OGLE | 20.8 | 0.076 | II | ~ +40d | (2) LSQ14xi | 12:30:41.17 | -13:46:21.9 | 20140217 | LSQ | 20.5 | 0.05 | Ia | ~ -7d | PS1-14on | 13:05:54.26 | +08:56:55.2 | 20140225 | PS1 | 18.5 | 0.07 | Ia | ~max | PS1-14nv | 15:02:44.81 | -28:19:40.3 | 20140224 | PS1 | 17.8 | 0.05 | Ia | ~ -7d | (3) OGLE-2014-SN-023 | 08:26:16.29 | -69:52:22.0 | 20140225 | OGLE | 19.2 | 0.28? | ? | ? | (4) PS1-14op | 13:10:43.42 | +18:47:53.5 | 20140225 | PS1 | 18.2 | - | - | - | (5) LSQ14tc | 13:27:29.80 | -30:33:31.3 | 20140214 | LSQ | 20.5 | 0.05 | Ia | ~max | CSS140222-141104+253050 | 14:11:04.41 | +25:30:49.9 | 20140222 | CRTS | 17.7 | 0.031 | Ib | +7d | (6)

(1) Narrow (~<1000 km/s) Halpha and Hbeta emission seen on a blue continuum, with a weak, broad absorption in Hbeta (-4500 km/s). The transient has an absolute magnitude ~-17.8, and is clearly offset from its host galaxy.
(2) Redshift measured from host galaxy emission lines.
(3) Best matches are to SN 1991T-like templates.
(4) The source has a blue continuum, with a broad (~2500 \kms) emission line at 8400 Ang. If this is Halpha, then the transient is at a redshift of z=0.28, with an absolute magnitude ~ -21.7. However, the sharp rise in the OGLE images (from mag<22 to 19 in two days) appears to be too fast for a SLSN. No host galaxy is apparent in the OGLE template image.
(5) Not visible on acquisition image.
(6) Redshift measured from host galaxy emission lines.