Electronic Telegram No. 1410 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 2008dj, 2008dk, 2008dl, 2008dm D. Sand, Steward Observatory; M. L. Graham and C. Bildfell, University of Victoria; S. Sivanandam, S. Herbert-Fort, and D. Just, Steward Observatory; C. J. Pritchet and H. Hoekstra, University of Victoria; and D. Zaritsky, Steward Observatory, report the discovery of four supernovae discovered on g' and r'-band images obtained at the Canada-France-Hawaii Telescope (+ Megacam). When possible, follow-up imaging at the Steward 2.3-m telescope (+ 90Prime camera) was obtained. Spectroscopic confirmation was obtained either with LDSS3 on the Magellan Clay telescope or the Blue- Channel Spectrograph on the MMT. The publicly available Supernova Identification code (Blondin and Tonry 2007, Ap.J. 666, 1024) was utilized. The spectra, finding charts, and discovery images are all available upon request. The g' magnitudes are tabulated below. SN 2008 UT R.A. (2000.0) Decl. Mag. Offset 2008dj May 3 15 19 40.74 + 6 16 53.0 21.8 1".29 E, 1".43 S 2008dk May 7 14 56 13.33 +18 51 14.1 19.6 0".51 W, 0".39 S 2008dl May 14 15 19 30.37 +48 53 56.8 22.2 2008dm June 3 11 43 23.16 +46 04 58.8 20.6 0".83 W, 2".33 S Additional magnitudes (+/- 0.1) for 2008dj: May 3, r' = 21.8 (Megacam); May 14, g' = 22.2 (90Prime camera); June 3, g' = 22.5, r' = 21.8 (Megacam); June 8, g' = 22.2, r' = 21.2 (90Prime camera). LDSS3 spectroscopy obtained on June 5 shows 2008dj to be a type-IIP supernova at z = 0.11, similar to spectra of SN 1999gi at about 25 days after explosion. The host galaxy of 2008dj has magnitudes g' = 18.55 +/- 0.02 and r' = 18.10 +/- 0.02. Additional magnitudes (+/- 0.1) for 2008dk from Megacam images: May 7, r' = 19.7; June 2, g' = 19.0, r' = 18.8. A BCS spectrum obtained on June 10 shows 2008dk to be a normal type-Ia sueprnova at z = 0.07 and around 20 days past maximum. The host galaxy for 2008dk has magnitudes g' = 22.95 +/- 0.03 and r' = 22.74 +/- 0.05. Additional Megacam magnitudes (+/- 0.1) for 2008dl: May 14, r' = 21.9; June 3, g' = 22.0, r' = 21.6. BCS spectroscopy of 2008dl on June 10 shows it to be a normal type-Ia supernova at z = 0.31 and 5-10 days past maximum; 2008dl is within about 0".1 of the host galaxy's center (the host galaxy itself has magnitudes g' = 23.11 +/- 0.03 and r' = 22.42 +/- 0.03). Megacam photometry on June 3 also gives r' = 20.6 +/- 0.1 for 2008dm. BCS spectroscopy obtained on June 10 shows 2008dm to be a normal type-Ia supernova at z = 0.22 and within about 7 days after maximum. The host galaxy of 2008dm has magnitudes g' = 19.53 +/- 0.01 and r' = 18.62 +/- 0.03. 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 1410) Daniel W. E. Green