[IAUC] CBET 2561: 20101203 : SUPERNOVA 2010kg IN NGC 1633

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                                                  Electronic Telegram No. 2561
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 2010kg IN NGC 1633
     [NOTE:  This text replaces that on CBET 2560.]
     Further to CBET 2552, I. Nayak, S. B. Cenko, W. Li, and A. V. Filippenko
report the LOSS discovery of an apparent supernova on unfiltered KAIT images:

 SN       2010 UT       R.A. (2000.0) Decl.      Mag.      Offset
 2010kg   Nov. 29.34   4 40 08.40  + 7 21 00.0   18.8    10".5 W, 3".0 N

Additional KAIT magnitudes for 2010kg:  a co-added frame from Sept.-Oct., [20.5;
Nov. 30.37 UT, 17.7.

     G. H. Marion, P. Challis, and R. Kirshner, Harvard-Smithsonian Center for
Astrophysics (CfA), on behalf of the CfA Supernova Group, report that a spectrum
(range 340-740 nm) of 2010kg was obtained on Dec. 1 UT by M. Calkins with the
F. L. Whipple Observatory 1.5-m telescope (+ FAST).  Cross-correlation with a
library of supernova spectra using the "Supernova Identification" code (SNID;
Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2010kg is a type-Ia
supernova more than one week before maximum brightness.  The velocity of the
Si II 635.5-nm feature, measured at the absorption minimum, is about 21200 km/s.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
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                         (C) Copyright 2010 CBAT
2010 December 3                  (CBET 2561)              Daniel W. E. Green