Electronic Telegram No. 2626

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, 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 15.8) on an unfiltered image taken on Jan. 5.30 UT with the 0.41-m 'PROMPT 5' telescope located at Cerro Tololo. The new object, which was confirmed at mag approximately 15.4 in an image taken with the 'PROMPT 5' telescope on Jan. 7.26, is located at R.A. = 11h17m54s.88 +/- 0".3, Decl. = -2°05'45".2 +/- 0".3 (equinox 2000.0), which is about 1".4 west and 14".4 south of the center of the galaxy UGC 6311. Nothing is visible at this position on archival images taken on 2010 May 4.05 and Dec. 17.30 (limiting mag 18.0).
Following posting on the Central Bureau's unconfirmed-objects webpage, D. D. Balam, Dominion Astrophysical Observatory, National Research Council of Canada; M. L. Graham, Las Cumbres Observatory Global Telescope, University of California at Santa Barbara; and E. Y. Hsiao, Lawrence Berkeley Laboratory, report that a spectrogram (range 385-694 nm, resolution 0.3 nm) of 2011C, obtained on Jan. 8.58 UT with the 1.82-m Plaskett Telescope of the National Research Council of Canada, shows it to be a type-Ia supernova about one week past maximum light. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that 2011C is most similar to the type-Ia supernova 2003cg at 6 days past maximum; the redshift derived from their fit is 0.025. .
2011 January 09
(C) Copyright 2010 CBAT
(CBET 2626)
Daniel W. E. Green