Electronic Telegram No. 2674 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION CBAT Director: Daniel W. E. Green; Hoffman Lab 209; Harvard University; 20 Oxford St.; Cambridge, MA 02138; U.S.A. e-mail: cbatiau@eps.harvard.edu (alternate cbat@iau.org) URL http://www.cbat.eps.harvard.edu/index.html Prepared using the Tamkin Foundation Computer Network SUPERNOVA 2011as IN UGC 3098 = PSN J04370666+4355353 Further to CBET 2640, A. Narla, S. B. Cenko, W. Li, and A. V. Filippenko report the LOSS discovery of an apparent supernova on unfiltered KAIT images: SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011as Jan. 24.30 4 37 06.66 +43 55 35.3 19.1 6".5 E, 0".5 N This object was designated PSN J04370666+4355353 when posted on the Central Bureau's TOCP webpage and is here designated SN 2011as based on the spectroscopic report below. Additional unfiltered CCD magnitudes for 2011as in UGC 3098: a co-added frame from images taken prior to 2011 Jan. 25, [20.3 (KAIT); 2011 Jan. 25.20 UT, 19.3 (KAIT); Feb. 6.070, 17.4 (X. Bros, Sabadell, Spain, 35-cm telescope; position end figures 06s.55, 35".5); Mar. 6.808, 17.8 (Bros; position end figures 06s.12, 35".3). J. M. Silverman, S. B. Cenko, and A. V. Filippenko, University of California, Berkeley, report that inspection of a CCD spectrum (range 330-1000 nm), obtained on Mar. 9 UT with the 10-m Keck I telescope (+ LRIS), shows that PSN J04370666+4355353 = 2011as is a type-II supernova with well-developed P-Cyg line profiles. The spectrum is consistent with an age of about 1.5 months, derived from the discovery and prediscovery images. After removal of the host-galaxy recession velocity of 3870 km/s (measured from narrow host-galaxy emission lines), they find the absorption minimum of the H-alpha line to be blueshifted by about 7600 km/s. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2011 CBAT 2011 March 11 (CBET 2674) Daniel W. E. Green