| SUPERNOVA
2010ds IN IC 4840
J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, P. Gonzalez,
S. Silva, G. Folatelli, R. Cartier, F. Forster, S. Marchi,
and A. Leal, 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 16.4 +/- 0.3) on an unfiltered
image taken on May 22.34 UT with the 0.41-m 'PROMPT
3' telescope located at Cerro Tololo. The new object,
which is also present at mag approximately 17.0 in an
image taken on June 4.08, is located at R.A. = 19h15m51s.46
+/- 0".1, Decl. = -56o12'30".9 +/- 0".1 (equinox 2000.0),
which is about 1".7 west and 1".9 north of the center
of the galaxy IC 4840. Nothing is visible at this position
on archival images taken on May 1.24 (limiting mag 18.5)
and Apr. 22.29 (limiting mag 18.0).
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