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PESSTO spectroscopic classification of optical transients

ATel #8132; M. Fraser (Cambridge), H. Campbell (Cambridge), J. Lyman (Warwick),J. Anderson (ESO), C. Inserra (QUB), I. Manulis (Weizmann), K. Maguire (QUB), S. J. Smartt (QUB), K. W. Smith (QUB), M. Sullivan (Southampton), S. Valenti (LCOGT), O. Yaron (Weizmann), D. Young (QUB), C. Baltay, N. Ellman, E. Hadjiyska, R. McKinnon, D. Rabinowitz, S. Rostami (Yale University), U. Feindt, M. Kowalski (Universitat Bonn), P. Nugent (LBL Berkeley), L. Wyrzykowski (Warsaw Observatory, Poland), D. Wright (QUB), K. Chambers, H. Flewelling, M. Huber, E. Magnier, J. Tonry, C. Waters, R. J. Wainscoat (IfA, Univ. Hawaii)
on 6 Oct 2015; 15:36 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Morgan Fraser (mf@ast.cam.ac.uk)

Subjects: Optical, Supernovae, Transient

PESSTO, the Public ESO Spectroscopic Survey for Transient Objects (see Smartt et al. 2015, A&A, 579, 40 http://www.pessto.org ), reports the following supernova classifications. Targets were supplied by the La Silla-Quest survey (see Baltay et al., PASP, 2013, 125, 683), the OGLE-IV Real-time Transient Search (Wyrzykowski et al., 2014 arxiv:1409.1095; http://ogle.astrouw.edu.pl/ ), the Pan-STARRS Survey for Transients (see Huber et al., ATel #7153) and the All Sky Automated Survey for SuperNovae ASAS-SN (see Shappee et al. 2014, ApJ, 788, 48 and http://www.astronomy.ohio-state.edu/~assassin/index.shtml ). All observations were performed on the ESO New Technology Telescope at La Silla on 2015 Oct. 05, 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
PS15cem | 22:45:13.21 | -22:43:39.7 | 2015-10-02 | PSST/ASAS-SN/LSQ | 16.5 | 0.010 | II | 5d | (1) PS15cez | 22:48:41.39 | -15:44:39.1 | 2015-10-02 | PSST | 18.8 | 0.08 | Ia | +8 to +10d | OGLE15lg | 00:59:13.42 | -66:16:05.0 | 2015-09-29 | OGLE | 19.2 | 0.07 | Ia | 0d |

(1) PS15cem was independently discovered by PSST (2015-10-3), ASAS-SN (ASASSN-15qh; 2015-10-4) and LSQ (LSQ15bed; 2015-10-4), with a recovered first detection on 2015-09-30 by LSQ and ASAS-SN. The spectrum is consistent with a young Type II SN a few days after explosion, with very weak, broad Halpha and Hbeta on a blue continuum.