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PESSTO spectroscopic classification of optical transients

ATel #9308; S. Mattila (Turku), M. Fraser (IoA), T. Reynolds (Turku), L. Galbany (Univ. de Chile), S. Taubenberger (ESO), C. Inserra (QUB), 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. 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), R. Scalzo, F. Yuan, M. Childress, B. Tucker, B. Schmidt (Australian National University).
on 3 Aug 2016; 16:07 UT
Credential Certification: Seppo Mattila (seppo.mattila@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) and SkyMapper (see Scalzo et al. ATel #5480). All observations were performed on the ESO New Technology Telescope at La Silla on 2016-08-02, 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).

 
 Survey Name | IAU Name  |  RA (J2000) | Dec (J2000) | Disc. Date | Source  | Disc Mag |    z   |     Type      | Phase    | Notes 
PS16dnq      | SN2016els | 20 30 13.92 | -10 57 01.8 | 2016-07-29 | PSST    | 18.69    | 0.217  |     SLSN-I    | -7 to -4 | (1) 
SMT-DWF16bc  |     --    | 21 09 08.37 | -66 53 25.0 | 2016-07-28 |SkyMapper| 18.60    | 0.056  |      Ia       |    -7    | (2)

(1) Redshift from narrow H and [O III] lines. At this redshift the absolute magnitude of -21.5 is consistent with a SLSN. The spectrum is blue, and shows the characteristic W shaped broad absorption associated with Type I SLSNe before the maximum light. We acknowledge the contribution of Zooniverse Citizen Scientists 'TED91', 'nilium' and 'voyager1682002'.
(2) Best fit with normal type Ia SNe e.g. SN 2003du a week before the maximum light.