http://www.cbat.eps.harvard.edu/iau/cbet/003900/CBET003962.txt Electronic Telegram No.3962 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 en eps.harvard.edu (alternate cbat en iau.org) URL http://www.cbat.eps.harvard.edu/index.html Prepared using the Tamkin Foundation Computer Network SUPERNOVA 2014cw IN PGC 68414 = PSN J22152655-1028346 V. Lipunov reports the discovery by S. Shurpakov of a possible supernova (mag 16.9) on 180-s unfiltered survey images (limiting mag 17.9) obtained with the MASTER Amur robotic telescope (0.40-m f/2.5 reflector) on Aug. 29.544 UT. The new object is located at R.A. = 22h15m26s.55, Decl. = -10o28'34".6 (equinox 2000.0), which is 7" east and 6" north of the center of the dwarf irregular galaxy PGC 68414. D. Denisenko and E. Gorbovskoy report that nothing is present at this position on the images taken by the similar MASTER Kislovodsk telescope on July 4.920 (limiting mag 17.9). The MASTER images are posted at URL http://master.sai.msu.ru/static/OT/221526.55-102834.6.jpg (reference chart at http://master.sai.msu.ru/static/OT/J2215-1028-JRIR.jpg; 10' x 10' field-of-view). The variable was designated PSN J22152655-1028346 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2014cw based on the spectroscopic confirmation reported below. CCD magnitudes for 2014cw reported by S. Howerton from images obtained with the iTelescope T18 instrument at the AstroCamp Observatory, Nerpio, Spain: Sept. 2.036, 16.1 (luminance filter; 180-s exposure; image posted at website URL https://www.flickr.com/photos/watchingthesky/14926081550); 2.996, V = 16.0. N. Elias-Rosa, L. Tartaglia, E. Cappellaro, and A. Pastorello, Osservatorio Astronomico di Padova, INAF; M. T. Botticella, Osservatorio Astronomico di Capodimonte, INAF; C. Inserra, Queen's University, Belfast; K. Maguire, European Southern Observatory; S. Smartt and K. W. Smith, Queen's University, Belfast; M. Sullivan, Southampton University; S. Valenti, Las Cumbres Observatory Global Telescope; O. Yaron, Weizmann Institute for Science; D. Young, Queen's University, Belfast; and I. Manulis, Weizmann Institute for Science report that an optical spectrogram (range 398.5-931.5 nm; 1.8-nm resolution) of PSN J22152655-1028346 = SN 2014cw was obtained on Sept. 2.98 UT with the European Southern Observatory's New Technology Telescope (+ EFOSC2 and Grism 13) at La Silla under the Public ESO Spectroscopic Survey for Transient Objects. A good match is found with the type-II supernova 1999gi (Leonard et al. 2002, A.J. 124, 2490) near maximum light, assuming a redshift z = 0.006 for the host galaxy. An expansion velocity of about 10000 km/s is derived from the minimum of the H I 656-nm line. Classifications was done with SNID (Blondin and Tonry 2007, Ap.J. 666, 1024) and GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383). Classification spectra can be obtained via WISeREP at website URL http://www.pessto.org. N. Morrell, M. M. Phillips, and C. Contreras, Las Campanas Observatory; G. H. Marion, University of Texas, Austin; E. Y. Hsiao, C. Gall, and M. D. Stritzinger, Aarhus University; and R. P. Kirshner, Harvard-Smithsonian Center for Astrophysics, report on the spectroscopic classification of PSN J22152655-1028346 = SN 2014cw using a near-infrared spectrogram (range 800-2500 nm) obtained on Sept. 3.15 UT with the FoldedPort Infrared Echellette (FIRE) spectrograph on the 6.5-m Magellan Baade Telescope at Las Campanas. The near-infrared spectrum is similar to that of SN 2013hj at approximately 10 days past explosion with weak hydrogen Paschen P-Cyg lines at the approximate redshift of z = 0.01. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2014 CBAT 2014 September 5 (CBET 3962) Daniel W. E. Green