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PESSTO spectroscopic classification of optical transients

ATel #4863; Cosimo Inserra, Matt Nicholl (Queen's University Belfast), Nic Walton, Nadia Blagorodnova (IoA, Cambridge), Morgan Fraser, Joe Polshaw (Queen's University Belfast), S. Benetti, A. Pastorello, (INAF - Padova Astronomical Observatory), S. Valenti (LCOGT/UCSB), S. Taubenberger (MPA Garching), S. J. Smartt, K. Smith, D. Young (Queen's University Belfast), M. Sullivan (University of Southampton), A. Gal-Yam, O. Yaron (Weizmann Institute for Science)
on 6 Mar 2013; 15:54 UT
Credential Certification: Morgan Fraser (mfraser02@qub.ac.uk)

Subjects: Optical, Cataclysmic Variable, Planet (minor), Supernovae, Transient

Referred to by ATel #: 4908, 5891

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 Catalina Real-time Transient Survey (http://crts.caltech.edu/), the OGLE-IV Transient Search (see Wyrzykowski et al., ATEL #4495) and the MASTER survey (http://observ.pereplet.ru/). All observations were performed on the ESO New Technology Telescope at La Silla on 2013 March 5, 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
SSS130304:055628-172343 | 05 56 28.13 | -17 23 42.8 | 20130304 | CRTS | 16.9 | 0 | CV | - | (1) OGLE2013-SN-017 | 04 27 22.29 | -74 42 09.2 | 20130108 | OGLE | 20.4 | 0.043 | SN IIn | ~50d | (2) SSS130304:114144-171349 | 11 41 44.14 | -17 13 48.7 | 20130304 | CRTS | 17.6 | 0.05 | SN Ia | ~max | Normal Ia around maximum light SSS130304:114445-203141 | 11 44 44.74 | -20 31 41.1 | 20130304 | CRTS | 17.1 | 0.03 | SN Ia | -7d | Normal Ia about a week pre-maximum MASTER OT J081031.62+111450.2 | 08 10 31.61 | +11 14 50.2 | 20130303 | Master | 16.4 | 0 | Minor planet | - | (3)

(1) Narrow Halpha, Hbeta and HeII 4686 on a blue continuum at z=0.

(2) Narrow, unresolved Halpha at z=0.043 is seen, along with broad Halpha emission, Ca NIR triplet emission and NaD absorption. The OGLE photometry shows a rapid rise, followed by a plateau in the lightcurve which has lasted 50 days and has an absolute magnitude of -18. We find good matches to the Type IIn SN 1999E, as well as the peculiar interacting transients SNe 2002ic and 2005gj.

(3) In an acquisition image from NTT+EFOSC2 there is no source at the reported position of the transient, down to a limiting magnitude of r~22. We note that the minor planet 1993 UB3 was at the reported coordinates at the discovery epoch, with a magnitude of V=16.9, and suggest that MASTER OT J081031.62+111450.2 is in fact 1993 UB3.