[IAUC] CBET 2626: 20110109 : SUPERNOVA 2011C IN UGC 6311

[quai en eps.harvard.edu]

                                                  Electronic Telegram No. 2626
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau en eps.harvard.edu (alternate cbat en iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2011C IN UGC 6311
     J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F. Forster, S.
Silva, F. Carrasco, P. Sanchez, and C. Hervias, Universidad de Chile; G.
Pignata and M. Cifuentes, Universidad Andres Bello; P. Gonzalez, Pontificia
Universidad Catolica de Chile; B. Conuel, Wesleyan University; G. Folatelli,
IPMU, University of Tokyo; 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 15.8) on an unfiltered image taken on
Jan. 5.30 UT with the 0.41-m 'PROMPT 5' telescope located at Cerro Tololo.
The new object, which was confirmed at mag approximately 15.4 in an image
taken with the 'PROMPT 5' telescope on Jan. 7.26, is located at R.A. =
11h17m54s.88 +/- 0".3, Decl. = -2o05'45".2 +/- 0".3 (equinox 2000.0), which
is about 1".4 west and 14".4 south of the center of the galaxy UGC 6311.
Nothing is visible at this position on archival images taken on 2010 May 4.05
and Dec. 17.30 (limiting mag 18.0).

     Following posting on the Central Bureau's unconfirmed-objects webpage,
D. D. Balam, Dominion Astrophysical Observatory, National Research Council of
Canada; M. L. Graham, Las Cumbres Observatory Global Telescope, University of
California at Santa Barbara; and E. Y. Hsiao, Lawrence Berkeley Laboratory,
report that a spectrogram (range 385-694 nm, resolution 0.3 nm) of 2011C,
obtained on Jan. 8.58 UT with the 1.82-m Plaskett Telescope of the National
Research Council of Canada, shows it to be a type-Ia supernova about one week
past maximum light.  Cross-correlation with a library of supernova spectra
using the "Supernova Identification" code (Blondin and Tonry 2007, Ap.J. 666,
1024) indicates that 2011C is most similar to the type-Ia supernova 2003cg at
6 days past maximum; the redshift derived from their fit is 0.025.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 January 9                   (CBET 2626)              Daniel W. E. Green