2012CBET.3163....1M

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; 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 13.5 ± 0.3) on an unfiltered image taken on June 26.98 UT with the 0.41-m 'PROMPT 3' telescope located at Cerro Tololo. The new object is located at R.A. = 13:11:09.04 ± 0".2, Decl. = -28:00:33.1 ± 0".2 (equinox 2000.0), which is about 6".9 west and 3".9 north of center of the galaxy ESO 443-80. The variable was designated PSN J13110904-2800331 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2012dh based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2012dh: June 20.04, [18.5 (CHASE); 23.11, [18.0 (CHASE); July 1.396, 14.7 (Joseph Brimacombe, Cairns, Australia; 41-cm RCOS telescope + STL6K camera + infrared filter; bandpass > 700 nm; position end figures 09s.05, 33".2; image posted at website URL http://www.flickr.com/photos/43846774@N02/7489603334/).