TT Boo outburst The SU UMa-type dwarf nova TT Boo is undergoing a bright outburst as indicated by the following observations. The brightness may suggest the superoutburst nature. The latest reported superoutburst of TT Boo occurred in 1998 Feb. YYMMDD(UT) mag observer 981226.224 <139 (E. Muyllaert) 981230.169 <137 (T. Kinnunen) 990110.180 128 (T. Kinnunen) 990110.247 126 (E. Muyllaert)