Electronic Telegram No. 1409 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://www.cfa.harvard.edu/iau/cbat.html SUPERNOVAE 2008dc, 2008dd, 2008de, 2008df, 2008dg, 2008dh, 2008di A. J. Drake, A. Mahabal, S. G. Djorgovski, M. J. Graham, and R. Williams, California Institute of Technology; E. C. Beshore and S. M. Larson, Lunar and Planetary Laboratory, University of Arizona; and E. Christensen, Gemini Observatory, report the discovery of seven apparent supernovae that were detected in multiple sequences of unfiltered CCD exposures of the Catalina Sky Survey (CSS) using the 0.7-m f/1.9 Catalina Schmidt telescope (+ 4000x4000 camera): SN 2008 UT R.A. (2000.0) Decl. Mag. Offset 2008dc Apr. 6.47 16 47 29.45 +09 18 25.8 18.1 - 2008dd Apr. 9.35 17 04 03.60 +21 35 42.0 17.7 - 2008de Apr. 17.38 15 55 24.97 -09 41 47.1 16.7 - 2008df May 5.37 16 06 25.06 +10 05 21.4 19.2 - 2008dg June 8.26 12 58 50.55 +24 22 57.4 18.5 7".0 E, 11".4 N 2008dh June 8.44 00 35 11.32 +23 15 15.1 16.6 12".6 E, 2".9 S 2008di June 11.19 12 16 41.53 +41 02 11.2 17.7 5".5 W, 11".8 S SN 2008dc was discovered and made public in CSS data and was later independently rediscovered and spectroscopically confirmed by the "Supernova Factory" collaboration (and posted at the following website URL: http://snfactory.lbl.gov/snf/open_access/snlist.php; they found 2008dc to be a type-Ib/c supernova at z = 0.02). Additional CSS magnitudes for 2008dd: Mar. 3.51 UT, [19.8; 23.51, 18.7; Apr. 9.35, 17.7; 16.38, 18.0; 26.45, 18.4; May 3.12, 18.5; 10.35, 18.6; June 11.32, 19.2. The host galaxy of 2008dd (J170403.64+213542.0) has Sloan Digital Sky Survey (SDSS) magnitudes g = 20.5, r = 20.1, and i = 19.8, and photometric redshift z = 0.043. SN 2008de was discovered and made public in CSS data and was also later independently rediscovered and spectroscopically confirmed by the "Supernova Factory" collaboration (who found it to be a type-II supernova at z = 0.04). Additional CSS magnitudes for 2008df: Apr. 13.38, [20.5; 28.43, 19.7; May 5.37, 19.2; 13.29, 18.9; June 6.26, 19.0. The host galaxy of 2008df (SDSS J160625.09+100521.0) has SDSS magnitudes g = 22.1, r = 21.8, i = 21.7. Additional magnitudes for 2008dg: Apr. 29.26, [20.0 (CSS); June 8.26, 18.5 (CSS); 16.25, 19.0 (Palomar 1.52-m reflector + Gunn r filter; non- photometric conditions). The host galaxy of 2008dg has SDSS magnitudes g = 17.8, r = 17.5, and i = 17.21, and photometric z = 0.043. Additional magnitudes for 2008dh: Feb. 13.08, [19.0 (CSS); June 8.44, 16.6 (CSS); 10.42, 16.4 (Palomar 1.52-m reflector + Gunn r filter); 11.42, 16.3 (Palomar; Gunn r). The host galaxy of 2008dh (2MASX J00351050+2315184) has 2MASS magnitudes J = 14.7, H = 14.2, and K = 13.8. Additional magnitudes for 2008di: May 8.33, [20.0 (CSS); June 11.19, 17.7 (CSS); 16.25, 18.5 (Palomar 1.52-m reflector + Gunn r filter; non- photometric conditions). The host galaxy of 2008di (SDSS J121642.18+410223.7) has SDSS magnitudes g = 17.9, r = 17.6, and i = 17.4, and spectroscopic redshift z = 0.039. S. Blondin, Harvard-Smithsonian Center for Astrophysics (CfA), on behalf of the CfA Supernova Group, reports that a spectrum (range 350-740 nm) of 2008dh, obtained on June 12.47 UT by M. Calkins with the F. L. Whipple Observatory 1.5-m telescope (+ FAST), shows it to be a type-Ia supernova around maximum light. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that 2008dh is most similar to the type-Ia supernova 2000dn at one week past maximum light, at a redshift cz = 11400 +/- 600 km/s, consistent with that determined from narrow lines in the host- galaxy spectrum (cz = 11032 +/- 237 km/s from four emission lines). Adopting this latter recession velocity for the supernova, the maximum absorption in the Si II line (rest 635.5 nm) is found to be blueshifted by roughly 10800 km/s. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2008 CBAT 2008 June 18 (CBET 1409) Daniel W. E. Green