Electronic Telegram No. 2615

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, and F. Carrasco, 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 16.2) on an unfiltered image taken on 2010 Dec. 29.30 UT with the 0.41-m 'PROMPT 4' telescope located at Cerro Tololo. The new object, which is also present at mag approximately 16.1 in an image taken on 2010 Dec. 30.28, is located at R.A. = 13h40m51s.56 +/- 0".2, Decl. = -48°23'03".1 +/- 0".2 (equinox 2000.0). Nothing is visible at this position on archival images taken on 2010 May 12.29 and July 3.18 (limiting mag 18.0).
M. Miluzio, S. Benetti, and F. Bufano, Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova; A. Pastorello, Queen's University, Belfast; and G. Pignata, Universidad Andres Bello, on behalf of a larger collaboration, report on spectroscopic observations (range 340-800 nm) of 2010ls obtained on 2010 Dec. 31.32 UT with the EFOSC2 spectrograph mounted on the New Technology Telescope at the European Southern Observatory. The spectrum of 2010ls is that an evolved type-IIb 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 https://gelato.tng.iac.es/login.cgi), 2010ls is found to be most similar to SN 1993J at about two months after maximum light.
2011 January 01
(C) Copyright 2010 CBAT
(CBET 2615)
Daniel W. E. Green