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ePESSTO spectroscopic classification of optical transients

ATel #10804; M. Fraser (University College Dublin) K. Rybicki (Warsaw Observatory), S. T. Hodgkin (Cambridge), E. Callis (UCD), T.-W. Chen (MPE), R. Cartier (CTIO), I. Manulis (Weizmann), C. Inserra (Southampton), E. Kankare (QUB), K. Maguire (QUB), S. J. Smartt (QUB), K. W. Smith (QUB), M. Sullivan (Southampton), S. Valenti (UC Davis), O. Yaron (Weizmann), D. R. Young (QUB), J. Tonry, B. Stalder, L. Denneau., A. Heinze, H. Weiland (IfA, Univ. of Hawaii), A. Rest (STScI)
on 30 Sep 2017; 15:28 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Morgan Fraser (morgan.fraser@ucd.ie)

Subjects: Optical, Supernovae, Transient

ePESSTO, the extended 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 ATLAS survey, see Tonry et al. (2011, PASP, 123, 58) and Tonry et al. (ATel #8680) 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 2017 Sept. 29, 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 and additional details can be obtained from http://www.pessto.org (via WISeREP) and the IAU Transient Name Server.

 
Survey Name  | IAU Name  | RA (J2000)  | Dec (J2000) | Disc. Date | Source    | Disc Mag | z     | Type | Phase | Notes 
ASASSN-17mm  | AT2017gvi | 17:56:57.12 | +07:26:08.9 | 20170915   | ASASSN    | 17.0     | ?     | ?    | ?     | (1) 
ATLAS17kvk   | SN2017gth | 01:12:38.13 | +05:46:00.3 | 20170823   | ATLAS     | 19.0     | 0.038 | IIb  | +3d   | (2) 

(1) Extremely low S/N spectrum with no discernible features on a slightly blue continuum.
(2) A relatively low S/N classification spectrum shows narrow [S II] and Halpha (spatially resolved in the 2d spectrum), which is likely contamination from the host. After removal of the narrow lines, a reasonable match to various Type IIb SNe is found. A broad, P-Cygni Halpha feature is present in the spectrum.