Electronic Telegram No. 2921

Central Bureau for Astronomical Telegrams
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138,
U.S.A. IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://www.cfa.harvard.edu/iau/cbat.html

SUPERNOVA 2011ii IN PGC 20555 = PSN J07163408-3829038
G. Pignata, M. Cifuentes, Y. Apostolovski, and M. Vidal, Universidad Andres Bello; J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F. Forster, S. Silva, F. Carrasco, P. Sanchez, C. Hervias, and R. Ramirez, Universidad de Chile; C. Farias and F. Aros, Pontificia Universidad Catolica de Chile; B. Conuel, Wesleyan University; G. Folatelli, IPMU, University of Tokyo; and D. Reichart, K. Ivarsen, J. Haislip, A. Crain, D. Foster, M. Nysewander, and A. LaCluyze, University of North Carolina at Chapel Hill, on behalf of the CHASE project (which is part of the Millennium Center for Supernova Science collaboration), report the discovery of an apparent supernova (mag approximately 17.6) on an unfiltered CCD image taken on Nov. 15.31 UT with the 0.41-m 'PROMPT 5' telescope located at Cerro Tololo. The new object is located at R.A. = 7h16m34s.08 +/- 0".2, Decl. = -38°29'03".8 +/- 0".2 (equinox 2000.0), which is about 12".0 west and 11".2 north of the center of the galaxy ESO 310-6 = PGC 20555. The variable was designated PSN J07163408-3829038 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2011ii. Additional approximate CCD magnitudes for 2011ii: Oct. 7.33, [18.5 (CHASE); Nov. 16.21, 17.0 (CHASE); 22.537, 16.8 (J. Brimacombe, Cairns, Australia; infrared filter; bandpass > 700 nm; position end figures 34s.03, 04".5). Brimacombe's image is posted at the following website URL: http://www.flickr.com/photos/43846774@N02/6386159609/.

F. Bufano, Istituto Nazionale di Astrofisica (INAF), Osservatorio Astronomico di Catania; S. Benetti, A. Pastorello, and S. Valenti, INAF, Osservatorio Astronomico di Padova; and G. Pignata, Universidad Andres Bello, on behalf of a larger collaboration, report that a noisy spectrum of PSN J07163408-3829038 = SN 2011ii, obtained on Nov. 17.27 UT with the New Technology Telescope (+ EFOSC2; range 360-930 nm; resolution 1.7 nm), shows it to be a type-Ib supernova. A comparison of the observed spectrum with a library of supernova spectra using the "GELATO" code (Harutyunyan et al. 2008, A.Ap. 488, 383; available at URL https://gelato.tng.iac.es/login.cgi) suggests that 2011ii is around maximum light.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars.

2011 November 28
(C) Copyright 2010 CBAT
(CBET 2921)
Daniel W. E. Green