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Spectroscopic confirmation of DES12S2a

ATel #4800; P. J. Brown, K. Krisciunas, J. Marshall, N. Suntzeff (Texas A&M University), 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), K. Barbary, J. P. Bernstein, R. Biswas, E. Kovacs, S. Kuhlmann, H. Spinka (Argonne National Laboratory)
on 8 Feb 2013; 19:02 UT
Credential Certification: Peter J. Brown (grbpeter@yahoo.com)

Subjects: Optical, Supernovae

We report optical spectroscopy of a supernova (SN) candidate discovered by the Dark Energy Supernova Survey (ATel #4668). The spectrum (450-1000 nm) of DES12S2a was obtained with the 9.2-m Hobby-Eberly Telescope (+Marcario Low-Resolution Spectrograph) by J. Caldwell. The spectrum shows a blue continuum with a narrow H-alpha emission feature atop a broader component indicative of a type IIn SN. The phase at the date of the spectrum given below is based on the DES light curves.

 
Name     | RA(J2000)  |  Dec(J2000) |  Discovery  | Discovery | Spectrum   | redshift | type | phase 
         |            |             |  date (UT)  | i mag     | date (UT)  |          |      | 
DES12S2a | 02:47:33.56| -01:06:39.9 | 2013 Jan 13 | 21.3      | 2013 Feb 2 | 0.115    | IIn  | 3-4 weeks after explosion