2011CBET.2661....1M

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; 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 an unfiltered image taken on Feb. 5.15 UT with the 0.41-m 'PROMPT 1' telescope located at Cerro Tololo. The new object (which was designated PSN J05535077-3244442 when posted on the Central Bureau's TOCP webpage, and which is here designated SN 2011ah based on the spectroscopic report below) is located at R.A. = 5:53:50.77 ± 0".2, Decl. = -32:44:44.2 ± 0".2 (equinox 2000.0), which is about 15".6 west and 7".2 south of the center of the galaxy ESO 364-12. Nothing is visible at this position on archival images taken on 2010 Dec. 31.25 (limiting mag 18.5) and 2011 Jan. 16.19 (limiting mag 18.0).