1 May 2010
IAU Electronic Telegram No.2266
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SUPERNOVA 2010cl IN MCG -02-25-20
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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. = 9h50m12s.32 +/- 0".1, Decl. = -12o03'09".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).
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
2010 May 1 (CBET 2266) Daniel W. E. Green