Electronic Telegram No. 538 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 SUPERNOVA 2006cu IN UGC 9530 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, 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 a supernova (mag approximately 18.1, calibrated to R) in NEAT images (cf. CBET 263) obtained on May 29.4 UT using the QUEST II camera in drift-scan mode on the Palomar 1.2-m Schmidt telescope. SN 2006cu is located at R.A. = 14h47m43s.31, Decl. = +9o39'33".9 (equinox 2000.0); the apparent host galaxy, UGC 9530, has z = 0.0286 (de Vaucouleurs et al. 1991, Third Ref. Cat. of Bright Galaxies, ver. 3.9). A spectrum (range 320-1000 nm), obtained on June 3.4 with the Supernova Integral Field Spectrograph on the University of Hawaii 2.2-m telescope, reveals that 2006cu is a type-IIn supernova, exhibiting the typical narrow Balmer emission lines. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2006 CBAT 2006 June 4 (CBET 538) Daniel W. E. Green