Electronic Telegram No. 540 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 2006cv AND 2006cw The "Nearby Supernova Factory" collaboration (P. Antilogus, S. Gilles, R. Pain, and R. Pereira, Laboratoire de Physique Nucleaire et de Haute Energies de Paris; N. Blanc, Y. Copin, E. Gangler, and G. Smadja, Institut de Physique Nucleaire de Lyon; G. Aldering, C. Aragon, S. Bailey, S. Bongard, M. J. Childress, D. Kocevski, S. Loken, P. Nugent, S. Perlmutter, K. Runge, R. Scalzo, R. C. Thomas, L. Wang, and B. A. Weaver, Lawrence Berkeley National Laboratory, Berkeley; E. Pecontal and G. Rigaudier, Centre de Recherche Astronomique de Lyon; R. Kessler, Kavli Institute for Cosmological Physics, Chicago; and C. Baltay, A. Bauer, D. Herrera, and D. Rabinowitz, Yale University) reports the discovery of two supernovae in NEAT images (cf. CBET 263) obtained on June 1.2 UT using the QUEST II camera in drift-scan mode on the Palomar 1.2-m Schmidt telescope. Spectra (range 320-1000 nm) obtained with the Supernova Integral Field Spectrograph on the University of Hawaii 2.2-m telescope on June 5.4 were used for classification. SN 2006cv (mag approximately 19.1, calibrated to R) is located at R.A. = 14h47m47s.83, Decl. = +23o17'58".6 (equinox 2000.0). A spectrum reveals that 2006cv is a type-IIn supernova at a redshift of z = 0.10, as measured from the peak of its narrow, prominent H-alpha emission. Balmer emissions H-beta through H-delta are also detected, as is He I 587.6-nm in weak emission. SN 2006cw (mag approximately 19.4) is located at R.A. = 15h03m01s.01, Decl. = +21o41'40".6, and a spectrum reveals it to be a type-II supernova at a redshift of z approximately 0.065, similar to the spectrum of SN 1993J at two to three weeks after explosion. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2006 CBAT 2006 June 6 (CBET 540) Daniel W. E. Green