SIMBAD references

Further to IAUC 8622, R. Quimby and P. Mondol, University of Texas, report the discovery of an apparent supernova in unfiltered CCD images taken with the 0.45-m ROTSE-IIIb telescope at the McDonald Observatory. SN 2006gt is located at R.A. = 0h56m17s.30, Decl. = -1d37'46".0 (equinox 2000.0), which is 10".8 west and 13".5 south of the center of the apparent host galaxy. Available approximate magnitudes for 2006gt: Sept. 18.26 UT, 18.5; 22.25, 18.2; 23.25, 17.8. The new object was found by subtracting a co-addition of images taken between 2005 July 16 and Nov. 7 (limiting mag about 19.1) from the 2006 September images. A spectrum (420-890 nm) of 2006gt, obtained on Sept. 23.29 with the 9.2-m Hobby-Eberly Telescope (+ Marcario Low-Resolution Spectrograph) by H. Edelmann and F. Deglman, shows it to be a type-Ia supernova. The spectrum is similar to that of SN 1992A around maximum light. Adopting the apparent host-galaxy redshift (z = 0.045, from Smith et al. 2004, A.J. 128, 1558, via NED), the expansion velocity derived from the minimum of the Si II 635.5 nm feature is 10600 km/s.