2006IAUC.8657....1Q

Further to IAUC 8622, R. Quimby, P. Mondol, and F. Castro, University of Texas, report the discovery of a supernova in unfiltered CCD images taken on 2005 Dec. 17.38, 2006 Jan. 3.34, and 7.35 UT (each showing the new object at mag about 17.2) using the 0.45-m ROTSE-IIIb telescope at the McDonald Observatory. SN 2005nb is located at R.A. = 12h13m37s.61, Decl. = +16o07'16".2 (equinox 2000.0; uncertainty ± 0".9), which is 1".5 west and 5" north of the center of UGC 7230 (the brighter galaxy in the pair). The supernova was found by subtracting a co-addition of images taken between 2005 Jan. 7 and Apr. 12 (limiting mag about 18.8). A spectrum (range 420-890 nm) of 2005nb, obtained on Jan. 8.39 UT with the 9.2-m Hobby-Eberly Telescope (+ Marcario Low-Resolution Spectrograph) by B. Roman and S. Rostopchin, shows it to be a type-Ic supernova (similar to the spectrum of SN 2002ap at 10 days past maximum (Gal-Yam et al. 2002, via the SUSPECT archive at http://bruford.nhn.ou.edu/~suspect/index1.html).