Electronic Telegram No. 2816

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 2011fo IN ESO 400-33 = PSN J20301588-3448325
G. Pignata and M. Cifuentes, Universidad Andres Bello; J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F. Forster, S. Silva, F. Carrasco, P. Sanchez, C. Hervias, D. Iturra, and R. Ramirez, Universidad de Chile; C. Farias, 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 16.9) on an unfiltered CCD image taken on Sept. 1.11 UT with the 0.41-m 'PROMPT 5' telescope located at Cerro Tololo. The new object, which is also present at mag approximately 16.8 on an image taken on Sept. 2.98, is located at R.A. = 20h30m15s.88 +/- 0".2, Decl. = -34°48'32".5 +/- 0".2 (equinox 2000.0), which is about 6".6 east and 10".7 north of center of the galaxy ESO 400-33. Nothing is visible at this position on archival images taken on July 22.23 (limiting mag 18.5) and Aug. 11.17 (limiting mag 18.0). The new object was designated PSN J20301588-3448325 when it was posted on the Central Bureau's TOCP webpage and is here designated SN 2011fo based on the spectroscopic report below.

E. Cappellaro, S. Benetti, and A. Pastorello, Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova; F. Bufano, Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Catania; and G. Pignata, Universidad Andres Bello, on behalf of a larger collaboration, report that a spectrogram (range 330-750 nm; resolution 1.5 nm) of PSN J20301588-3448325 = SN 2011fo, obtained on Sept. 6.1 UT with the European Southern Observatory's New Technology Telescope (+ EFOSC), shows that 2011fo is a young, heavily extinguished [E(B-V) about 0.7], type-II supernova. After cross-correlation with a library of supernova spectra via the "GELATO" code (Harutyunyan et al. 2008, A.Ap. 488, 383; available at URL https://gelato.tng.iac.es/login.cgi), the spectrum appears similar that of SN 2009at few days after explosion.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars.

2011 September 31
(C) Copyright 2010 CBAT
(CBET 2816)
Daniel W. E. Green