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Spectroscopic confirmation of DES12S1a

ATel #4741; P. J. Brown, K. Krisciunas, J. Marshall, N. Suntzeff (Texas A&M University), K. Barbary, J. P. Bernstein, R. Biswas, E. Kovacs, S. Kuhlmann, H. Spinka (Argonne National Laboratory), E. Ahn, D. Finley, J. Frieman, J. Marriner, W. Wester (Fermilab), G. Aldering, J. S. Bloom, A. Kim, P. Nugent, S. Perlmutter, R. C. Thomas (Lawrence Berkeley National Laboratory), S. Desai, K. Paech (Ludwig Maximilians University, Munich), R. C. Smith (NOAO/CTIO), R. Kessler (University of Chicago), R. A. Covarrubias (University of Illinois / NCSA), R. Cane, J. A. Fischer, S. Gilhool, L. Gladney, R. Gupta, J. Mosher, M. Sako (University of Pennsylvania), H. Campbell, C. D'Andrea, R. Nichol, A. Papadopoulos (University of Portsmouth), M. Sullivan (University of Southampton), M. March (University of Sussex), M. Smith (University of the Western Cape)
on 17 Jan 2013; 21:21 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Peter J. Brown (grbpeter@yahoo.com)

Subjects: Optical, Supernovae

Referred to by ATel #: 4780

We report optical spectroscopy of a supernova (SN) candidate discovered by the Dark Energy Supernova Survey (ATel #4668). The spectrum (450-1000 nm) of DES12S1a was obtained with the 9.2-m Hobby-Eberly Telescope (+Marcario Low-Resolution Spectrograph) by S. Rostopchin. The spectrum shows a blue continuum with a strong, narrow H-alpha emission feature superimposed on broader H-alpha emission indicative of a type IIn SN. The redshift of the SN is consistent with the apparent host galaxy SDSS J024942.76+004535.4. The phase at the date of the spectrum given below is based on the DES multi-band light curves.

Name     | RA(J2000)   |  Dec(J2000) |  Discovery  | Discovery | Spectrum    | redshift | type | phase 
         |             |             |  date (UT)  | i mag     | date (UT)   |          |      | 
DES12S1a | 02:49:42.18 | 00:45:35.4  | 2012 Dec 04 | 20.0      | 2013 Jan 13 | 0.036    | IIn  | one month after optical maximum