2012CBET.3076....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 15.4) on an unfiltered image taken on Mar. 26.38 UT with the 0.41-m 'PROMPT 5' telescope located at Cerro Tololo. The new object, which is also present at mag approximately 15.2 in an image taken on Mar. 27.37, is located at R.A. = 20:23:55.28 ± 0".2, Decl. = -48:21:17.3 ± 0".2 (equinox 2000.0), which is about 42".9 east and 14".6 north of the center of the galaxy ESO 234-19. Nothing is visible at this position on archival images taken on Mar. 11.38 (limiting mag 18.5) and in stack of fifteen 40-s images taken between 2011 Mar. 24.35 and Nov. 9.10 (limiting mag 20.5). The variable was designated PSN J20245528-4821173 based on an erroneous digit (24s instead of 23s for the right ascension) when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2012bl based on the spectroscopic confirmation reported below.