Electronic Telegram No. 2641

Central Bureau for Astronomical Telegrams
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138,
U.S.A. IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://www.cfa.harvard.edu/iau/cbat.html

J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F. Forster, S. Silva, F. Carrasco, P. Sanchez, and C. Hervias, Universidad de Chile; G. Pignata and M. Cifuentes, Universidad Andres Bello; P. Gonzalez, Pontificia Universidad Catolica de Chile; B. Conuel, Wesleyan University; G. Folatelli, Institute for the Physics and Mathematics of the Universe (IPMU), University of Tokyo; and D. Reichart, K. Ivarsen, J. Haislip, A. Crain, D. Foster, M. Nysewander, and A. LaCluyze, University of North Carolina at Chapel Hill, on behalf of the CHASE project, report the discovery of an apparent supernova (mag approximately 17.8 +/- 0.5) on an unfiltered image taken on Jan. 20.18 UT with the 0.41-m 'PROMPT 5' telescope located at Cerro Tololo. The new object (which was designated PSN J05513518-5902513 on the Central Bureau's TOCP webpage and which is also present at mag approximately 17.3 in an image taken on Jan. 21.05) is located at R.A. = 05h51m35s.18 +/- 0".2, Decl. = -59°02'51".3 +/- 0".2 (equinox 2000.0), which is about 0".6 west and 7".4 south of the center of the galaxy ESO 120-16. Nothing is visible at this position on archival images taken on 2010 Dec. 20.27 and 2011 Jan. 12.07 (limiting mag 18.5).
I. Cosimo and F. Bufano, Istituto Nazionale di Astrofisica (INAF), Osservatorio Astrofisico di Catania; S. Benetti and S. Valenti, INAF, Osservatorio Astronomico di Padova; A. Pastorello, Queen's University, Belfast; and G. Pignata, Universidad Andres Bello, on behalf of a larger collaboration, report on a spectroscopic observation (range 365-925 nm; resolution 1.8 nm) of 2011N obtained on Jan. 25.05 UT with the EFOSC2 spectrograph mounted on the New Technology Telescope at the European Southern Observatory. The spectrum of 2011N is that of a heavily reddened type-Ic supernova; from a comparison with a library of supernova spectra performed with the "GELATO" code (Harutyunyan et al. 2008, A.Ap. 488, 383; available at the following website URL: https://gelato.tng.iac.es/login.cgi), 2011N is found to be most similar to SN 2004aw (Taubenberger et al. 2006, MNRAS 371, 1459) around maximum light. A reddening of E(B-V) about 0.7 and a redshift of 0.01135, as derived from the EW and position of the Na I D interstellar doublet, respectively, have been assumed.
2011 January 25
(C) Copyright 2010 CBAT
(CBET 2641)
Daniel W. E. Green