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PESSTO spectroscopic classification of optical transients

ATel #8325; H. Kuncarayakti (MAS, DAS), J. Harmanen (Turku, NOT), T. Kangas, S. Mattila (Turku), M. Fraser (IoA), M. T. Botticella (INAF-Capodimonte), 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), C. Baltay, N. Ellman, E. Hadjiyska, R. McKinnon, D. Rabinowitz, S. Rostami (Yale University), U. Feindt, M. Kowalski (Universitat Bonn), P. Nugent (LBL Berkeley), D. Wright (QUB), K. Chambers, H. Flewelling, M. Huber, E. Magnier, J. Tonry, C. Waters, R. J. Wainscoat (IfA, Univ. Hawaii)
on 23 Nov 2015; 16:11 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Tuomas Kangas (tjakan@utu.fi)

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 La Silla QUEST (LSQ, see Baltay et al. 2013, PASP, 125, 683), Pan-STARRS Survey for Transients (see Huber et al., ATel #7153), 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 ) and the TOCP webpage (see below). All observations were performed on the ESO New Technology Telescope at La Silla on 2015 Nov. 22, using EFOSC2 and Grism 13 with the 1.5 arcsec slit due to poor seeing (3985-9315A, 27A 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
ASASSN-15ta | 20 29 33.02 | -61 57 03.4 | 20151114 | ASAS-SN | 16.80 | 0.015 | Ib | pre-max | (1) LSQ15bpg | 02 41 06.90 | -29 32 34.1 | 20151116 | LSQ | 20.65 | - | - | - | (2) PS15cww | 04 56 33.69 | +04 45 26.2 | 20151117 | PSST | 19.45 | 0.063 | IIn | ~max | (3) PSNJ20293645-4350277 | 20 29 36.44 | -43 50 27.7 | 20151116 | TOCP | 17.60 | 0.023 | Ic | +20 | (4)

(1) A good fit to type Ib SN 2004gq at -7 days, but this would mean the first ASAS-SN detection on 2015-11-14 is ~16 days before maximum. Blue continuum may be contamination by host galaxy, but it appears to be a high-velocity, young type Ib. Strong narrow host galaxy lines. Redshift from host galaxy.
(2) Extremely noisy spectrum.
(3) Blue continuum, resolved Balmer line emission with FWHM ~2000 km/s. SN IIn around maximum based on the light curve.
(4) Best fit to SN 1990aa (Ic) at 19 days after maximum. Narrow host galaxy lines. Redshift from host galaxy.