Electronic Telegram No. 2913

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

SUPERNOVA 2011ic = PSN J10153321-2034060 [Editor's note: this text replaces that on CBET 2912.]
J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F. Forster, S. Silva, F. Carrasco, P. Sanchez, C. Hervias, and R. Ramirez, Universidad de Chile; G. Pignata, M. Cifuentes, Y. Apostolovski, and M. Vidal, Universidad Andres Bello; C. Farias and F. Aros, Pontificia Universidad Catolica de Chile; B. Conuel, Wesleyan University; G. Folatelli, 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 (which is part of the Millennium Center for Supernova Science collaboration), report the discovery of an apparent supernova (mag approximately 16.0) on unfiltered images taken on Nov. 18.30 and 20.33 UT with the 0.41-m 'PROMPT 5' telescope located at Cerro Tololo. The new object is located at R.A. = 10h15m33s.21 +/- 0".2, Decl. = -20°34'06".0 +/- 0".2 (equinox 2000.0), which is about 7".5 east and 55".4 north of the center of the presumed host galaxy. Nothing is visible at this position on archival images taken on May 15.98 (limiting mag 18.5). The variable was designated PSN J10153321-2034060 when it was posted on the Central Bureau's TOCP webpage and is here designated SN 2011ic based on the spectroscopic confirmation reported below.

M. Stritzinger, Oskar Klein Centre, Stockholm University, on behalf of the Millennium Center for Supernova Science, reports that he obtained a spectrogram on May 21.2 UT of PSN J10153321-2034060 = SN 2011ic with the Gemini-South telescope (+ GMOS). The spectrum reveals 2011ic to be a type-Ia supernova around a month past maximum. Comparison with a library of supernova spectra using the SNID program (Blondin and Tonry 2007, Ap.J. 666, 1024) provides excellent matches with SN 2002bo between 40 and 50 days past maximum.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars.

2011 November 23
(C) Copyright 2010 CBAT
(CBET 2913)
Daniel W. E. Green