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Classification of DES15S1nog by GTC

ATel #8717; R. Casas, F. J. Castander (ICE, IEEC/CSIC, Barcelona), M. Childress, C. D'Andrea, M. Smith, M. Sullivan (University of Southampton), R. Maartens (University of the Western Cape), R. Gupta, E. Kovacs, S. Kuhlmann, H. Spinka (Argonne National Laboratory), E. Ahn, D. A. Finley, J. Frieman, J. Marriner, W. Wester (Fermilab), G. Aldering, A. G. Kim, R. C. Thomas (Lawrence Berkeley National Laboratory), K. Barbary, J. S. Bloom, D. Goldstein, P. Nugent, S. Perlmutter (Lawrence Berkeley National Laboratory + University of California, Berkeley), R. J. Foley, Y.-C. Pan (University of Illinois), S. Desai, K. Paech (Ludwig Maximilians University, Munich), R. C. Smith (NOAO/CTIO), M. Schubnell (University of Michigan), R. Kessler, J. Lasker, D. Scolnic (University of Chicago), D. J. Brout, L. Gladney, M. Sako, R. C. Wolf (University of Pennsylvania), P. J. Brown, K. Krisciunas, N. Suntzeff (Texas A&M University), R. Nichol, A. Papadopoulos (University of Portsmouth)
on 21 Feb 2016; 17:38 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Mathew Smith (matsmith2@gmail.com)

Subjects: Optical, Supernovae

We report optical spectroscopy of a supernova candidate discovered by the Dark Energy Survey (ATel #4668). The spectrum (490-920nm) was obtained using OSIRIS on the Gran Telescope CANARIAS (GTC). Object classification was performed using SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) and superfit (Howell et al, 2005, ApJ, 634, 119), the details of which are reported in the table below.

Name       | RA (J2000)| Dec (J2000)|Discovery  |Discovery|Spectrum   |Redshift| Type  | Phase  |Notes 
           |           |            |Date (UT)  |Mag (r)  |Date (UT)  |        |       |        | 
DES15S1nog |02:52:14.98|-00:44:36.3 |2015 Dec 08|  22.4   |2016 Feb 11| 0.565  |SLSN-I?|post-max|a,b 
a). Redshift from galaxy emission features 
b). The GTC spectrum is well-matched to literature SLSN-I, such as 2011ke. However, our spectrum only extends to 3150A in the rest-frame, and thus does not cover the strong UV absorption features that usually categorise these events. We therefore classify it as a 'SLSN-I?'