Electronic Telegram No. 2099
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
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SUPERNOVA 2009nb
     G. Pignata, Universidad Andres Bello; J. Maza, M. Hamuy, R. Antezana, L.
Gonzalez, P. Gonzalez, P. Lopez, S. Silva, G. Folatelli, R. Cartier, F.
Forster, S. Marchi, and A. Rojas, 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 18.3 +/- 0.4) on an unfiltered image taken on Dec. 25.27
UT with the 0.41-m 'PROMPT 4' telescope located at Cerro Tololo.  The new
object, which is also present in a stack of eleven 40-s images taken on Dec.
26.21 (at mag approximately 18.5) and Dec. 20.26 (at mag approximately 18.4),
is located at R.A. = 10h28m04s.68 +/- 0".1, Decl. = -35o30'02".2 +/- 0".1
(equinox 2000.0), which is about 4".6 east and 2".3 north of the center of
the apparent host galaxy.  Nothing is visible at this position a stack of
thirty-six 40-s archival images taken with the same instrument between 2008
Dec. 25.26 and 2009 Nov. 22.29 (limiting mag 21.0).


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2009 CBAT
2009 December 27                 (CBET 2099)              Daniel W. E. Green