Electronic Telegram No. 3823 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 2014aa IN NGC 3861 = PSN J11450358+1958254 Ron Arbour, South Wonston, Hants, U.K., reports the discovery of an apparent supernova (mag 15.7) on an unfiltered CCD image (limiting mag about 19.0) taken on Mar. 7.991 UT using a 35-cm f/6 Schmidt-Cassegrain telescope (+ SXVF H9 camera) in the course of his supernova patrol. The new object is located at R.A. = 11h45m03s.58, Decl. = +19d58'25".4 (equinox 2000.), which is 4" due west of the galaxy NGC 3861. Nothing is visible at this position on the Digitized Sky Survey blue (1986 Mar. 3) and red (1992 Apr. 28) plates from the Palomar Sky Surey. The variable was designated PSN J11450358+1958254 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2014aa based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2014aa: Mar. 9.004, 15.7 (Gianluca Masi, Francesca Nocentini, and Patrick Schmeer; remotely using a 43-cm f/6.8 corrected Dall-Kirkham robotic telescope near Ceccano, Italy; position end figures 03s.53, 25".1); 9.021, 15.2 (Giancarlo Cortini, Predappio, Italy; 0.35-m Schmidt-Cassegrain telescope + SXVR H-9 camera; limiting mag 19.0). L. Tomasella, S. Benetti, E. Cappellaro, N. Elias-Rosa, P. Ochner, A. Pastorello, 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 J11450358+1958254 = SN 2014aa, obtained on Mar. 8.99 UT with the Asiago 1.82-m Copernico Telescope (+ AFOSC), shows it to be a type-Ia supernova. Adopting for the host galaxy (NGC 3861) the redshift z = 0.01698 (Cortese et al. 2008, MNRAS 383, 1519; via NED), a good match is found with several type-Ia supernovae about one week before B-band maximum light. An expansion velocity of about 13900 km/s is derived from the minimum of the Si II 635-nm line. 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). N. Blagorodnova, N. Walton, and M. Fraser, Institute of Astronomy; M. Dennefeld, Institut Astrophysique de Paris; S. Taubenberger, Max-Planck- Institut fuer Astrophysik, Garching; S. Benetti and A. Pastorello, Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica (INAF); C. Inserra, S. Smartt, K. Smith, and D. Young, Queen's University, Belfast; M. Sullivan, University of Southampton; S. Valenti, Las Cumbres Observatory Global Telescope; O. Yaron and A. Gal-Yam, Weizmann Institute for Science; C. Knapic, R. Smareglia, and M. Molinaro, Trieste Astronomical Observatory, INAF; and I. Manulis, Weizmann Institute for Science, report that a spectrogram (range 398.5-931.5 nm; resolution 1.8 nm) of PSN J11450358+1958254 = SN 2014aa was obtained on Mar. 8 with the 3.6-m New Technology Telescope (+ EFOSC2 and Grism 13) at La Silla. Cross-correlating the spectrum with a library of supernovae template spectra using SNID (Blondin and Tonry 2007, Ap.J. 666, 1024), good matches are found to a range of normal type-Ia supernovae at the redshift of NGC 3861 (z = 0.017), a few days before 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 March 10 (CBET 3823) Daniel W. E. Green