Electronic Telegram No. 2218

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) URL http://cfa-www.harvard.edu/iau/cbat.html

SUPERNOVAE 2010av AND 2010aw

Further to CBET 2211, A. Narla, J. Rex, S. B. Cenko, W. Li, and A. V.
Filippenko, University of California, report the LOSS discovery of two
apparent supernovae on unfiltered KAIT images:

 SN       2010 UT        R.A. (2000.0) Decl.      Mag.      Offset
 2010av   Mar. 19.44   15 06 57.01  +56 30 27.8   17.9    18".6 E,  5".9 S
 2010aw   Mar. 19.54   17 16 12.28  +31 47 36.4   18.3    19".0 E,  3".1 N

Additional KAIT magnitudes for 2010aw in IC 1099:  2010 Feb. 14.59 UT, [19.3;
Mar. 20.48, 17.9.  Additional KAIT magnitudes for 2010aw in UGC 10781:  a
co-added image from exposures taken during 2009 Sept. 4-Oct. 3, [19.5; 2010
Mar. 20.51, 18.1.
J. M. Silverman, I. K. W. Kleiser, A. J. L. Morton, and A. V. Filippenko,
University of California, Berkeley, report that inspection of CCD spectra
(range 340-1000 nm), obtained on Mar. 22 UT with the 3-m Shane reflector (+
Kast) at Lick Observatory, shows that 2010aw is likely a type-Ib/c supernova.
Cross-correlation with a library of supernova spectra using the "SuperNova
IDentification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) indicates
that 2010aw is a few days past maximum light and that the most likely redshift
is about 0.04.  However, narrow emission lines from the host galaxy are
present in the spectrum at redshift 0.029.  SN 2010aw is a young type-II
supernova; the H-alpha emission greatly dominates over the absorption
component.

Host galaxy info: vel= 6878 km/s; 0.93 x 0.40; 15.0g; S

SN type info: II

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