Electronic Telegram No. 135 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 2005bb AND 2005bf N. Morrell, M. Hamuy, G. Folatelli, and C. Contreras, Carnegie Supernova Project, report that spectroscopic observations (range 380-930 nm) of SN 2005bf (cf. IAUC 8507) and SN 2005bb (cf. IAUC 8504) were obtained on Apr. 7.08 and 7.23 UT, respectively, with the Las Campanas 2.5-m du Pont telescope (+ WFCCD spectrograph). SN 2005bf is a type-Ic supernova a few days before maximum light, with very strong Si II 635.5-nm and a weak He I 587.6-nm P Cyg line, among other features. SN 2005bb is of type II, highly reddened, with strong P-Cyg profiles in H-alpha and Ca II 857.9-nm, and weak He I 587.6-nm. The expansion velocity, derived from the minimum of the H-alpha absorption, is 6000 km/s, assuming for the host galaxy the recession velocity given in the NED database. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the formal IAU Circulars. (C) Copyright 2005 CBAT 2005 April 10 (CBET 135) Daniel W. E. Green