Electronic Telegram No. 2327 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION CBAT Director: Daniel W. E. Green; Room 209; Dept. of Earth and Planetary Sciences; Harvard University; 20 Oxford St.; Cambridge, MA 02138; U.S.A. e-mail: cbat@iau.org; cbatiau@eps.harvard.edu URL http://www.cfa.harvard.edu/iau/cbat.html SUPERNOVAE 2010ef, 2010eg, AND 2010eh Further to CBET 2302, J. L. Prieto, Carnegie Observatories; A. J. Drake, S. G. Djorgovski, A. Mahabal, M. J. Graham, and R. Williams, California Institute of Technology; M. Catelan, Pontificia Universidad Catolica de Chile; E. C. Beshore and S. M. Larson, Lunar and Planetary Laboratory, University of Arizona; and E. Christensen, Gemini Observatory, report the CRTS discovery of supernovae in unfiltered Catalina Sky Survey (CSS) and Siding Spring Survey (SSS) images: SN 2010 UT R.A. (2000.0) Decl. Mag. Offset 2010ef June 5.33 16 28 52.10 +26 22 29.0 19.1 0".7 E, 0".9 S 2010eg June 7.75 22 15 42.56 - 9 20 17.3 18.5 1".6 E, 1".2 N 2010eh June 13.38 20 48 13.54 - 5 48 13.0 17.4 0".3 W, 30".4 N Further unfiltered CCD magnitudes for 2010ef: May 9.80 UT, [20.2 (SSS); June 8.80, 18.5 (SSS); 10.43, 18.5 (Mt. Lemmon Survey). Further unfiltered CCD magnitudes for 2010eg: May 24.31, [19.5 (CSS). Further magnitudes for 2010eh: June 5.41, [19.0 (CSS). J. Prieto, Carnegie Observatories, reports that optical spectra (range 370-930 nm; resolution 0.7 nm) of 2010ef, 2010eg, and 2010eh were obtained with the APO 3.5-m telescope (+ DIS) on June 15 UT. After cross-correlation with a library of supernova spectra using SNID (Blondin and Tonry 2007, Ap.J. 666, 1024), the following spectral classifications were obtained: 2010ef is a normal type-Ia supernova at z = 0.11 (redshift from the supernova spectrum) around maximum light; 2010eg is a type-Ia supernova at z = 0.09 (redshift from the supernova spectrum), also around maximum; and 2010eh looks like a type-Ic supernova at z = 0.020 (redshift of the host galaxy, MCG -01-53-11, from the Sloan Digital Sky Survey) around maximum, although SNID also provides relatively good fits with some type-Ib-supernova templates. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2010 CBAT 2010 June 17 (CBET 2327) Daniel W. E. Green