2012CBET.3058....1P

G. Pignata, M. Cifuentes, Y. Apostolovski, and M. Vidal, Universidad Andres Bello; 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; 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 16.6) on a unfiltered image taken on Jan. 21.33 UT with the 0.41-m 'PROMPT 1' telescope located at Cerro Tololo. The new object is located at R.A. = 15:22:25.12 ± 0".2, Decl. = -38:12:04.2 ± 0".2 (equinox 2000.0), which is about 7".3 east and 6".3 south of the center of the galaxy ESO 328-46. The variable was designated PSN J15222512-3812042 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2012ba based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2012ba: 2011 Jan. 12.34-May 9.21, [20.5 (stack of fourteen 80-s CHASE images); May 15.20, [17.5 (CHASE); 2012 Jan. 24.29, 16.3 (CHASE); Feb. 1.706, 15.9 (J. Brimacombe, Cairns, Australia; 41-cm RCOS telescope + STL6K camera + infrared filter, bandpass > 700 nm; position end figures 25s.17, 03".9; image posted at http://www.flickr.com/photos/43846774@N02/6805173999/).