Electronic Telegram No. 2755 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 2011dv IN NGC 6078 = PSN J16120400+1412330 F. Ciabattari, Borgo a Mozzano, Italy, reports the discovery of a point- like object (mag 16.2) on unfiltered CCD images (limiting magnitude 19.2) obtained on June 28.86 UT with a 0.5-m Newtonian telescope in the course of the Italian Supernovae Search Project, the new object being located at R.A. = 16h12m04s.62, Decl. = +14d12'33".2 (equinox 2000.0; astrometry with respect to UCAC-2 stars), which is 13" west of the center of the galaxy NGC 6078. The variable was designated PSN J16120400+1412330 when posted on the Central Bureau's TOCP webpage and is here designated SN 2011dv based on the spectroscopic confirmation reported below. Additional magnitudes for 2011dv as provided by Ciabattari: 1992 Apr. 30, [20.3 (Palomar Sky Survey, J plate); 1994 June 8, [20.3 (Palomar Sky Survey, F plate); 2010 June, [19.1 (images taken by Ciabattari); 2011 June 29.98 UT, 16.0 (A. Dimai, Cortina d'Ampezzo, Italy; and S. Leonini, Siena, Italy; remotely using the GRAS-7 PlaneWave 43-cm CDK telescope in Spain). D. C. Leonard, San Diego State University; J. Moustakas, University of California at San Diego; B. J. Swift and D. McCarthy, University of Arizona; V. Bailey, E. Carrico, A. Carter, E. Chui, E. Douglas, E. Eggeman, R. Goldberg, R. Grant, K. Hartman, J. Hellerstein, E. Hooper, C. Horlick-Cruz, L. Hunter, T. Jiles, E. D. Johnson, K. Kumar, L. Lappe, J. Lee, W. Lee, F. Marsh, G. Mehta, P. Miller, R. Rampalli, J. Reed, K. Rice, H. Saldivar, M. Salgado-Flores, A. Schlingman, W. F. Schlingman, W. M. Schlingman, S. Scibelli, K. Sinclair, I. Steincamp, N. Stock, N. Todd, L. L. Aizpuru Vargas, S. Yamanaka, and E. Zachary, 2011 Advanced Teen Astronomy Camp, report that inspection of a low-dispersion optical spectrum (range 370-690 nm) of PSN J16120400+1412330 = SN 2011dv, obtained with the 2.3-m Bok telescope (+ Boller & Chivens spectrograph) at Steward Observatory on June 30 UT, shows it to be a normal type-Ia supernova near maximum light. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) finds good matches with near-maximum (2 +/- 6 days) template spectra of SN 1992A and SN 2002bo. Adopting the NASA/IPAC Extragalactic Database recession velocity for NGC 6078 of 9378 km/s (Falco et al. 1999, PASP 111, 438), the maximum absorption in the Si II line (rest 635.5 nm) is blueshifted by approximately 13600 km/s. D. D. Balam, Dominion Astrophysical Observatory, National Research Council of Canada (NRCC); M. L. Graham, Las Cumbres Observatory Global Telescope, University of California at Santa Barbara; E. Y. Hsiao, Lawrence Berkeley Laboratory; and D. W. E. Green, Harvard University, report that a spectrogram (range 389-725 nm., resolution 0.3 nm) of PSN J16120400+1412330 = SN 2011dv, obtained on June 30.27 UT with the 1.82-m Plaskett Telescope of the NRCC, shows it to be a type-Ia supernova about five days past maximum light. Cross-correlation with a library of supernova spectra using the SNID code indicates that 2011dv is most similar to the type-Ia supernova 2006gz at five days past maximum light. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2011 CBAT 2011 June 30 (CBET 2755) Daniel W. E. Green