Electronic Telegram No. 2692

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 2011bj = PSN J20522450-3335540 J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F. Forster, S. Silva, F. Carrasco, P. Sanchez, C. Hervias, and D. Iturra, Universidad de Chile; G. Pignata and M. Cifuentes, Universidad Andres Bello; 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 17.6) on an unfiltered images taken on Apr. 3.37 and 4.40 UT with the 0.41-m 'PROMPT 3' telescope located at Cerro Tololo. The new object (which was designated PSN J20522450-3335540 when posted on the Central Bureau's TOCP webpage and is here designated SN 2011bj due to the spectroscopic report below) is located at R.A. = 20h52m24s.51 +/- 0".2, Decl. = -33°35'54".1 +/- 0".2 (equinox 2000.0), which is about 8".9 west and 12".5 north of center of the presumed host galaxy. Nothing is visible at this position on archival images taken on 2010 Oct. 11.14 and 24.10 (limiting mag 18.5).

N. Morrell, Las Campanas Observatory; P. Lira, Universidad de Chile; and G. Pignata, Universidad Andres Bello, on behalf of the Millennium Center for Supernova Science, report optical spectroscopy (range 360-920 nm) of PSN J20522450-3335540 = SN 2011bj obtained on Apr. 6.3 UT with the Las Campanas 2.5-m du Pont telescope (+ WFCCD). Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2011bj is a type-IIP supernova about a month after explosion.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars.

2011 April 10
(C) Copyright 2010 CBAT
(CBET 2692)
Daniel W. E. Green