Electronic Telegram No. 2704 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 SUPERNOVAE 2011R AND 2011bs-2011bx [NOTE: This item replaces that on CBET 2703; the object designated therein as 2011by is apparently the previously-announced supernova 2011R (cf. CBET 2645). The designation 2011by will be re-used.] A. J. Drake, S. G. Djorgovski, A. Mahabal, M. J. Graham, and R. Williams, California Institute of Technology; J. L. Prieto, Carnegie Observatories; M. Catelan, Pontificia Universidad Catolica de Chile; E. C. Beshore and S. M. Larson, Lunar and Planetary Laboratory, University of Arizona; and E. Christensen, Gemini Observatory, report the Catalina Real-time Transient Survey's discovery of several apparent supernovae in unfiltered survey images taken at Catalina, Mt. Lemmon, and Siding Spring: SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011bs Mar. 27.35 14 36 49.84 +23 01 50.4 18.5 1" W 2011bt Mar. 28.30 12 52 55.22 + 7 46 51.7 19.2 2011bu Mar. 30.26 12 29 31.80 - 7 30 39.1 19.8 2011bv Mar. 30.35 13 02 53.57 - 4 02 36.0 18.8 2011bw Mar. 30.50 15 35 58.75 +21 18 42.8 19.2 2011bx Apr. 2.45 4 42 12.57 -48 44 12.6 17.1 2" W, 1" S SN 2011bx was given the provisional designation PSN J04421257-4844126 when posted by Drake on the Central Bureau's TOCP webpage. Joseph Brimacombe, Cairns, Australia, reports that he imaged 2011bx remotely using a 41-cm RCOS telescope + U9000 CCD camera at the Macedon Ranges Observatory, near Melbourne, Victoria, on Apr. 6.456 UT, measuring unfiltered mag 16.7 and position end figures 12s.52, 13".8; he has posted his image at the following website URL: http://www.flickr.com/photos/43846774@N02/5596333415/. J. L. Prieto, Carnegie Observatories, reports that optical spectra (range 380-920 nm; resolution 0.7 nm) were obtained of the above variables with the du Pont 2.5-m telescope (+ WFCCD) at Las Campanas Observatory on Apr. 9 and 11 UT, showing that all are indeed supernovae. After cross-correlation with a library of supernova spectra using SNID (Blondin and Tonry 2007, Ap.J. 666, 1024), the following spectral classes, redshifts, and approximate phases (in days after maximum light) were obtained: SN Type Redshift phase 2011R II 0.03 2011bs II 0.036 +16 2011bt Ia 0.114 +15 2011bu Ia 0.149 +10 2011bv IIb 0.077 + 1 2011bw Ia 0.089 +36 2011bx Ia 0.058 + 1 NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2011 CBAT 2011 April 21 (CBET 2704) Daniel W. E. Green