Electronic Telegram No. 2897 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 2011hn IN UGC 4747 = PSN J09031745+3035364 S. Howerton, Arkansas City, KS, U.S.A.; A. J. Drake, S. G. Djorgovski, A. Mahabal, M. J. Graham, and R. Williams, California Institute of Technology; J. L. Prieto, Princeton University; M. Catelan, Pontificia Universidad Catolica de Chile; R. H. McNaught and G. Garradd, Australian National University; E. C. Beshore and S. M. Larson, Lunar and Planetary Laboratory, University of Arizona; and E. Christensen, Gemini Observatory, report the discovery of an apparent supernova in public images from the Catalina Sky Survey (CSS). SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011hn Oct. 3.48 9 03 17.45 +30 35 36.4 17.8 35".5 E, 7".6 N This variable was designated PSN J09031745+3035364 when it was posted on the Central Bureau's TOCP webpage and is here designated SN 2011hn based on the spectroscopic confirmation reported below. Further unfiltered CCD magnitudes for 2011hn: Apr. 30.22 UT, [18.7 (CSS); Oct. 6.464 (Joseph Brimacombe, Cairns, Australia; position end figures 17s.42, 41".0); 10.438, 17.3 (Brimacombe); 14.48, 17.4 (Brimacombe); 19.497, 17.3 (Brimacombe). Brimacombe's Oct. 6 image is posted at URL http://www.flickr.com/photos/43846774@N02/6222045988/; his Oct. 10 image is at http://www.flickr.com/photos/43846774@N02/6233343508/; his Oct. 14 image is at http://www.flickr.com/photos/43846774@N02/6247340829/; his Oct. 19 image is at http://www.flickr.com/photos/43846774@N02/6262398655/. L. Tomasella, S. Valenti, A. Pastorello, M. Fiaschi, and S. Benetti, Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova, on behalf of a larger collaboration, report that a spectrogram of PSN J09031745+3035364 = SN 2011hn was obtained on Oct. 31.08 UT with the Ekar- Copernico 1.82-m telescope (+ AFOSC; range 380-820 nm; resolution 2.2 nm). A comparison of the observed spectrum with a library of supernova spectra using the "GELATO" code (Harutyunyan et al. 2008, A.Ap. 488, 383) suggests that 2011hn is a normal type-IIP supernova about 3 weeks after the explosion. The spectrum shows prominent P-Cyg H and Fe II features. The expansion velocity, as deduced from the position of the minimum of H_alpha, is about 7200 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 November 3 (CBET 2897) Daniel W. E. Green