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PESSTO spectroscopic classification of optical transients

ATel #8320; J. Harmanen (Turku, NOT), H. Kuncarayakti (MAS, DAS), S. Mattila, T. Kangas (Turku), M. T. Botticella (INAF-Capodimonte), M. Fraser (IoA), C. Inserra (QUB), E. Kankare, K. Maguire, S. J. Smartt, K. W. Smith (QUB), M. Sullivan (Southampton), S. Valenti (UC Davis), O. Yaron (Weizmann), D. Young (QUB), I. Manulis (Weizmann), D. Wright (QUB), K. Chambers, H. Flewelling, M. Huber, E. Magnier, J. Tonry, C. Waters, R. J. Wainscoat (IfA, Univ. Hawaii), L. Wyrzykowski,(Warsaw Observatory, Poland).
on 22 Nov 2015; 17:38 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Tuomas Kangas (tjakan@utu.fi)

Subjects: Optical, Supernovae

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 Pan-STARRS Survey for Transients (see Huber et al., ATel #7153), OGLE-IV Real-time Transient Search (Wyrzykowski et al., 2014 arxiv:1409.1095; http://ogle.astrouw.edu.pl/ ), and CRTS (Drake et al. 2009, 696, 870 ; http://crts.caltech.edu/ ) (see below). All observations were performed on the ESO New Technology Telescope at La Silla on 2015 Nov. 21, 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
PS15cwb | 10 16 21.57 | -11 00 10.5 | 20151021 | PSST | 20.11 | 0.145 | Ia | +20 | OGLE15rw | 06 27 24.94 | -67 31 50.0 | 20151112 | OGLE | 19.81 | 0.071 | Ia | ~max | CSS151120-044526-190158 | 04 45 25.70 | -19 01 57.5 | 20151120 | CRTS | 18.16 | 0.073 | Ia | -5 | (1)

(1) Best matches to 1991T-like SNe a few days to a week before maximum.

NB: Supernova PS15cwz was reported as a 1991bg-like SN Ia in ATel #8306. However, its redshift was overestimated by SNID, and at the host galaxy redshift z=0.029 a 2002es-like SN Ia at 3 days after maximum provides the best fit.