Electronic Telegram No. 3777 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 2014C IN NGC 7331 = PSN J22370560+3424319 Further to CBET 3772, M. Kim, W. Zheng, W. Li, and A. V. Filippenko, University of California at Berkeley; and S. B. Cenko, Goddard Space Flight Center, report the LOSS discovery of a supernova in NGC 7331 on unfiltered KAIT images: SN 2014 UT R.A. (2000.0) Decl. Mag. Offset 2014C Jan. 5.09 22 37 05.60 +34 24 31.9 15.5 19".7 E, 24".2 S The supernova was also detected at red mag about 17.1 three days earlier on a pre-discovery image taken on Jan. 2.10 UT. A finding chart was posted at URL http://astro.berkeley.edu/~zwk/findingchart/PSN_J22370560+34243193.jpg. The variable was designated PSN J22370560+3424319 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2014C based on the spectroscopic confirmation reported below. The type-II supernova 2013bu also appeared in NGC 7331 (cf. CBET 3498). Additional CCD magnitudes for 2014C: 2013 Dec. 26, [18.5 (KAIT); 2014 Jan. 4.861, 15.8 (Ron Arbour, South Wonston, U.K.; 35-cm f/6 reflector; pre-discovery image; position end figures 05s.59, 31".3; offset 18" east, 25" south); 6.702, 15.3 (Gianluca Masi, Francesca Nocentini, and Patrick Schmeer; remotely using a 43-cm telescope near Ceccano, Italy; position end figures 05s.59, 31".4); 8.09, 14.5 (KAIT; measurement after subtraction of background light). Jujia Zhang, Yunnan Observatories (YNAO); and Xiaofeng Wang, Tsinghua University, report on an optical spectrogram (range 360-910 nm) of PSN J22370560+3424319 = SN 2014C that was obtained on Jan. 5.54 UT with the 2.4-m telescope (+ YFOSC) at the LiJiang Gaomeigu Station of the YNAO. The spectrum is consistent with a young type-Ib supernova. Strong Na I D lines in the spectra indicates that this supernova suffers a significant line-of-sight reddening. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2014C matches with SN 1999ex at -6 days. Adopting a recession velocity of 816 km/s for the host galaxy, NGC 7331 (Springob 2005, Ap.J. Supp. 160, 149), they measure a velocity of the He 587.6-nm absorption feature to be about 13800 km/s and a velocity of the Si II 635.5-nm absorption to be about 9900 km/s. L. Tartaglia, A. Pastorello, S. Benetti, E. Cappellaro, L. Tomasella, P. Ochner, N. Elias-Rosa, and M. Turatto, Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica, report that an optical spectrogram (range 340-820 nm; resolution 1.3 nm) of PSN J22370560+3424319 = SN 2014C, obtained on Jan. 8.32 UT with the Asiago 1.82-m Copernico Telescope (+ AFOSC), shows that this is a type-Ib supernova. Adopting for the host galaxy (NGC 7331) a redshift z = 0.00272 (Springob et al. 2005, Ap.J. Suppl. 160, 149; via NED), good matches are obtained with the type-Ib supernovae 1999dn (Benetti et al. 2011, MNRAS 411, 2726) and 1999ex (Hamuy et al. 2002, A.J. 124, 417) at around maximum light. The Asiago classification spectra are posted at website URL http://sngroup.oapd.inaf.it; classification was made via GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383) and SNID (Blondin and Tonry 2007, Ap.J. 666, 1024). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2014 CBAT 2014 January 11 (CBET 3777) Daniel W. E. Green