Electronic Telegram No. 3795 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 2014L IN M99 = PSN J12184868+1424435 Tianmeng Zhang, National Astronomical Observatories of China (NAOC); and Xiaofeng Wang, Jun Mo, and Juncheng Chen, Tsinghua University, report the discovery of an apparent supernova (mag 17.2) on unfiltered CCD images taken on Jan. 26.83 UT using the 0.6-m NAOC Schmidt telescope in the course of the THU-NAOC Transient Survey (TNTS). The new object is located at R.A. = 12h18m48s.68, Decl. = +14d24'43".5 (equinox 2000.0), which is 13".8 west and 15".9 south of the center of the galaxy M99 (= NGC 4254). Nothing is visible at this position on a Digitized Sky Survey image (Palomar Sky Survey cited, but no additional information provided). The TNTS images are posted at URL http://www.thca.tsinghua.edu.cn/~wangxf/TNTS/PSNJ12184868+1424435.png. The variable was designated PSN J12184868+1424435 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2014L based on the spectroscopic confirmation reported below. H. Yamaoka, Kyushu University, reports that K. Itagaki (Yamagata, Japan, 0.50-m reflector) found a trace of 2014L on a pre-discovery CCD image from Jan. 24.847. Additional CCD magnitudes for 2014L: Jan. 2, [20.0 (TNTS); 26.762, 17.9 (Itagaki; host- galaxy light subtracted; image posted at http://www.k-itagaki.jp/m99.jpg); 28.292, V = 15.4, Ic = 15.0 (Seiichiro Kiyota, Kamagaya, Japan; remotely with a 25-cm iTelescope astrograph + SBIG ST-10XME camera located near Mayhill, NM, USA; photometry uncertain close proximity to the nucleus of M99; position end figures 48s.67, 44".3; reference stars from UCAC3 catalogue; image posted at http://meineko.sakura.ne.jp/ccd/PSN_J12184868+1424435.jpg); 28.4, 15.7 (Ernesto Guido, Nick Howes, and Martino Nicolini; iTelescope 50-cm f/6.8 astrograph near Mayhill; position end figures 48s.73, 44".3; UCAC-3 catalogue reference stars; image posted at website URL http://bit.ly/1e4aiII); 28.928, 14.8 (P. Bacci and R. Bacci, San Marcello, Italy; 0.60-m f/4 reflector; position end figures 48s.75, 45".3); 28.968, 15.1 (Gianluca Masi, Francesca Nocentini, and Patrick Schmeer; remotely using a 43-cm telescope near Ceccano, Italy; position end figures 48s.73, 44".4); 28.996, 15.4 (Marco Mancini and Marco Burali, Pistoia, Italy; Takahashi FRC 300 telescope + FLI 1001 camera); 29.031, 16.1 (Federica Luppi and Luca Buzzi, Varese, Italy; 0.60-m f/4.6 reflector; position end figures 48s.74, 44".1; image posted at URL http://www.astrogeo.va.it/pub/TOCP/PSN_M99.jpg); 29.052, V = 15.9 (M. Martignoni, Magnago, Italy; 25-cm reflector); position end figures 48s.73, 43".2; PPMXL reference stars); 29.367, B = 16.0, V = 15.7, R = 15.4 (Joseph Brimacombe, Cairns, Australia; remotely using a 51-cm RCOS telescope at the New Mexico Skies observatory near Mayhill; position end figures 48s.68, 44".7; image posted at URL http://www.flickr.com/photos/43846774@N02/12215830803/). W.-X. Li, H.-N. Sai, and X.-F. Wang, Tsinghua University; and T.-M. Zhang, National Astronomical Observatories of China, report on an optical spectrogram (range 370-860 nm) of PSN J12184868+1424435 = SN 2014L that was obtained on Jan. 27.82 UT with the 2.16-m telescope (+ BFOSC) at the Xinglong Station of the NAOC. The spectrum is consistent with that of a type-Ic supernova. Strong Na I D lines in the spectra indicate that this supernova suffers a considerable amount of line-of-sight reddening. Adopting a recession velocity of 2406 km/s for the host galaxy, NGC 4254 (Springob 2005, Ap.J. Supp. 160, 149), they measure a velocity of the Si II 635.5-nm absorption to be about 10600 km/s. J.-J. Zhang, Yunnan Astronomical Observatory (YNAO); amd X.-F. Wang, Tsinghua University, report on an optical spectrogram (range 350-900 nm) of PSN J12184868+1424435 = SN 2014L that was obtained on Jan. 27.93 UT with the 2.4-m telescope (+YFOSC) at the LiJiang Gaomeigu Station of YNAO. The spectrum resembles that of a type-Ic supernova at around maximum light, but showing remarkably strong narrow emission lines that are likely due to the background H II regions; cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that it matches with SN 1997dq at +1 days, but this identification may be affected by the reddening. Adopting a recession velocity of 2406 km/s for the host galaxy, NGC 4254 (Springob 2005, Ap.J. Suppl. 160, 149), they measure the velocity of the Si II 635.5-nm absorption feature to be about 10700 km/s. Strong absorption troughs due to O I 777.4-nm and the Ca II near-infrared triplet are also present. P. Ochner, S. Benetti, A. Pastorello, L. Tomasella, N. Elias-Rosa, E. Cappellaro, and M. Turatto, Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica, report that an optical spectrogram (range 340-800 nm; resolution 1.1 nm) of PSN J12184868+1424435 = SN 2014L, obtained on Jan. 29.16 UT with the Asiago 1.22-m Galileo Telescope (+ Boller & Chivens spectrograph), shows it to be a type-Ic supernova. Adopting for the host galaxy (M99) a recessional velocity of 2407 km/s (RC3, via NED), a good match is found with the type-Ic supernova 1994I at three days before maximum light (Clocchiatti et al. 1996, Ap.J. 462, 462). 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). H. Akitaya, R. Itoh, Y. Moritani, and K. S. Kawabata, Hiroshima University; T. Sato, Saitama University; and K. Tateuchi, University of Tokyo, on behalf of the "Optical and Infrared Synergetic Telescopes for Education and Research" (OISTER), obtained a low-resolution optical spectrum (range 450-900 nm) of PSN J12184868+1424435 = SN 2014L on Jan. 28.6 UT with the 1.5-m Kanata telescope (+ HOWPol) at Higashi-Hiroshima Observatory. The spectrum shows a prominent broad absorption of the Ca II infrared triplet centered around 805 nm. Shallow features due to Na I 589-nm/He I 588-nm and to Si II 635-nm are possibly seen. A comparison with a library of supernova spectra using GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383) suggests that 2014L is a type-Ic supernova near maximum light. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2014 CBAT 2014 January 30 (CBET 3795) Daniel W. E. Green