SIMBAD references

Ron Arbour, South Wonston, Hants, U.K., reports his discovery of an apparent supernova (mag 17.3) on unfiltered CCD images (limiting mag 18.8) taken on Apr. 1.9579 UT using a 35-cm f/6 Schmidt-Cassegrain telescope (+ Starlight Xpress CCD camera) in the course of his supernova patrol. The new object (which was designated PSN J12043294+2012114 when posted on the Central Bureau's TOCP webpage and is here designated SN 2011bc based on the spectroscopic reports below) is located at R.A. = 12:04:32.94, Decl. = +20:12:11.4 (equinox 2000.0), which is 5".8 east and 6".5 south of the center of the galaxy NGC 4076. Nothing is visible at this position on the Digitized Sky Survey blue plate from 1990 Mar. 22 or the red plate from 1997 Mar. 9 (limiting mag about 20.0).

Additional unfiltered CCD magnitudes for PSN J12043294+2012114 = SN 2011bc: 2007 Feb. 24.690 UT, [19.5 (K. Itagaki, Yamagata, Japan; communicated by S. Nakano, Sumoto); 2011 Mar. 31.638, 18.5 (Itagaki; pre-discovery observation; position end figures 32s.96, 11".6; communicated by Nakano); Apr. 3.172, 17.9 (Joseph Brimacombe, Cairns, Australia; remotely using a 51-cm RCOS telescope + STL11K camera at New Mexico Skies Observatory, Mayhill, NM, U.S.A.; position end figures 32s.98, 10".6); 3.691, 16.7 (N. Kojima, Aichi, Japan, 0.25-m f/6.3 Schmidt-Cassegrain reflector; position end figures 32s.93, 11".9; offset 6" east, 6" south; independent discovery; communicated by Nakano). Brimacombe has posted his image at the following website URL: http://www.flickr.com/photos/43846774@N02/5584270215/. Itagaki has posted his images at http://www.k-itagaki.jp/images/4076.jpg. The type-Ia supernova 2007M also appeared in NGC 4076 (cf. CBET 816).