| SUPERNOVA
2010bk IN NGC 4433
J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, P. Gonzalez,
S. Silva, G. Folatelli, R. Cartier, F. Forster, S. Marchi,
and A. Rojas, 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 17.6 +/- 0.4) on an unfiltered
image taken on Apr. 4.19 UT with the 0.41-m 'PROMPT
5' telescope located at Cerro Tololo. The new object,
which is also present at mag approximately 17.8 in images
taken on Apr. 5.18 and 7.01, is located at R.A. = 12h27m38s.47
+/- 0".1, Decl. = -8°16'39".3 +/- 0".1 (equinox 2000.0),
which is about 2".8 west and 9".9 north of the center
of the galaxy NGC 4433. Nothing is visible at this position
in archival images taken on Apr. 1.19 (limiting mag
17.5) or on a stack of archival images taken between
2009 Mar. 12.22 and 2010 Mar. 29.20 (limiting mag 20.0).
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