Electronic Telegram No. 3644 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 2013fc IN ESO 154-10 = PSN J02450896-5544273 G. Pignata, Y. Apostolovski, E. Paillas, S. Varela, F. Bufano, F. Olivares, and K. Takats, Universidad Andres Bello; M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F. Forster, S. Silva, F. Carrasco, and R. Ramirez, Universidad de Chile; F. Aros, Pontificia Universidad Catolica de Chile; B. Conuel, Wesleyan University; G. Folatelli, IPMU, University of Tokyo; and D. E. Reichart, J. B. Haislip, J. P. Moore, and A. P. LaCluyze, University of North Carolina at Chapel Hill, on behalf of the CHASE project (which is part of the Millennium Center for Supernova Science collaboration), report the discovery of an apparent supernova (mag approximately 15.4) on an unfiltered image taken on Aug. 20.21 UT with the 0.41-m 'PROMPT 1' telescope located at Cerro Tololo. The new object is located at R.A. = 2h45m08s.96 +/- 0".2, Decl. = -55o44'27".3 +/- 0".2 (equinox 2000.0), which is about 1".9 east and 0".5 south of the center of the galaxy ESO 154-10. The variable was designated PSN J02450896-5544273 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2013fc based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2013fc: July 2.34, [18.0 (CHASE); Aug. 22.23, 15.4 (CHASE); 25.528, V = 15.90 and I_c = 14.75 (Seiichiro Kiyota, Kamagaya, Japan; T30 iTelescope 0.5-m astrograph at Siding Spring; image posted at URL http://meineko.sakura.ne.jp/ccd/PSN_J02450896-5544273.jpg); 25.626, 15.9 (Joseph Brimacombe, Cairns, Australia; 41-cm RCOS telescope + infrared filter; position end figures 09s.00, 27".7; image posted at website URL http://www.flickr.com/photos/43846774@N02/9595702910/). C. Inserra, Queen's University of Belfast (QUB); E. Kankare, T. Kangas, and S. Mattila, University of Turku; M. Fraser, QUB; R. Scalzo, Australian National University; M. Nicholl, QUB; A. Gal-Yam and O. Yaron, Weizmann Institute for Science; S. Benetti and A. Pastorello, Istituto Nazionale di Astrofisica (INAF), Padova; S. Valenti, Las Cumbres Observatory Global Telescope and University of California at Santa Barbara; S. Taubenberger, Max-Planck-Institut fuer Astrophysik, Garching; S. J. Smartt, K. Smith, and D. Young, QUB; M. Sullivan, University of Southampton; and C. Knapic, M. Molinaro, and R. Smareglia, INAF, Trieste, on behalf of the PESSTO collaboration (see website URL http://www.astronomerstelegram.org/?read=4037), report that an optical spectrogram (range 360-910 nm) of PSN J02450896-5544273 = SN 2013fc, obtained on Aug. 29.41 UT at the 3.6-m New Technology Telescope (+ EFOSC2) at La Silla Observatory, shows it to be a type-IIn supernova. Adopting a recession velocity of 5586 km/s for ESO 154-10 (Loveday et al. 1996, Ap.J. Suppl. 107, 201; via NED), the best fits to the 2013fc spectrum found by GELATO (Harutyunyan et al. 2008, A.Ap. 488,383; publicly available at website URL https://gelato.tng.iac.es