2010CBET.2266....1M

J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, P. Gonzalez, S. Silva, G. Folatelli, R. Cartier, F. Forster, and S. Marchi, Universidad de Chile; G. Pignata and M. Cifuentes, Universidad Andres Bello; B. Conuel, Wesleyan University; 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 17.1 ± 0.3) on an unfiltered image taken on Apr. 29.01 UT with the 0.41-m 'PROMPT 4' telescope located at Cerro Tololo. The new object, which is also present at mag approximately 17.2 in an image taken on Apr. 29.99, is located at R.A. = 9:50:12.32 ± 0".1, Decl. = -12:03:09.2 ± 0".1 (equinox 2000.0), which is about 24".0 west and 18".4 north of the center of the galaxy MCG -02-25-20. Nothing is visible at this position on archival images taken on Mar. 29.09 (limiting mag 18.0) and Feb. 4.13 (limiting mag 18.5).