Electronic Telegram No. 1389 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 SUPERNOVA 2008cr D. Sand, Steward Observatory; M. L. Graham, University of Victoria; D. Just, Steward Observatory; C. J. Pritchet and H. Hoekstra, University of Victoria; and D. Zaritsky, Steward Observatory, report the discovery of a type-Ia supernova on g' and r'-band images obtained at the Canada-France- Hawaii Telescope (+ Megacam) on Apr. 2 UT, the supernova's magnitudes then being g' = 22.5 +/- 0.1 and r' = 21.7 +/- 0.1. The new object is located at R.A. = 11h43m34s.44, Decl. = +46o22'03".6 (equinox 2000.0), which is 0".08 east and 0".91 north of the presumed center of the spiral host galaxy, which itself has magnitudes g' = 22.5 and r' = 21.5. Nothing was detected at this position in CFHT/Megacam reference images from Feb. 2008 (limiting magnitudes g' about 23.5 and r' about 23.5). Imaging at the Steward 2.3-m telescope (+ 90Prime camera) on Apr. 8 confirmed the new object at magnitudes g' = 22.9 +/- 0.1 and r' = 21.7 +/- 0.1. Follow-up spectroscopy, obtained with the MMT (+ Blue Channel Spectrograph) at Mt. Hopkins on Apr. 28, indicates a normal type-Ia supernova at z = 0.41 and around 10-15 days past maximum (via the publicly available supernova-identification code of Blondin and Tonry 2007, Ap.J. 666, 1024). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2008 CBAT 2008 May 30 (CBET 1389) Daniel W. E. Green