SUPERNOVA 2010cn
G. Pignata and M. Cifuentes, Universidad Andres Bello;
J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, P. Gonzalez,
S. Silva, G. Folatelli, R. Cartier, F. Forster, and
S. Marchi, Universidad de Chile; 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 +/- 0.3) on an unfiltered
image taken on May 4.05 UT with the 0.41-m 'PROMPT 5'
telescope located at Cerro Tololo. The new object, which
is also present at mag approximately 17.2 in an image
taken on May 4.98, is located at R.A. = 11h04m06s.57
+/- 0".1, Decl. = +4°49'58".7 +/- 0".1 (equinox 2000.0).
Nothing is visible at this position on archival images
taken on Apr. 4.13 (limiting mag 17.5) and (in a stack
of five 40-s images) on Mar. 25.01 (limiting mag 18.7).
The surface brightness of the presumed host galaxy has
no clear galaxy core.
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