2010CBET.2115....1N

S. Nakano, Sumoto, Japan, reports the discovery by Masaki Tsuboi (Asakita-ku, Hiroshima) of an apparent supernova (mag 14.4) on 30-s, unfiltered CCD frames (limiting mag 17.7) taken around Jan. 7.730 UT using a 0.30-m f/5.3 reflector + unfiltered CCD. The new object, designated 2010B, was measured by Tsuboi to be located at R.A. = 13:54:08.7, Decl. = +60:40:50.4 (equinox 2000.0), which is 5".1 west and 9".1 north of the center of NGC 5370; Nakano measures position end figures 08s.82, 49".6 and magnitude 14.1 from the discovery image (and 09s.49, 40".7 for the center of the galaxy). Nothing is visible at this location on Tsuboi's past frames taken on 2009 Sept. 6 and Nov. 21 UT (limiting mag 16.7) and on the Digitized Sky Survey (DSS), and he reports mag 14.5 for 2010B on Jan. 8.661. Nakano adds that K. Kadota (Ageo, Saitama-ken, Japan) has measured position end figures 08s.74, 50".4 and mag 14.4 from an unfiltered CCD frame (limiting magnitude 19.0) taken by K. Itagaki (Teppo-cho, Yamagata, Japan) on Jan. 8.64 using a 0.30-m f/7.8 reflector at the Takanezawa Station, Tochigi-ken, noting that nothing is visible at this position on red and infrared DSS images from 1997. Kadota also co-added ten 60-s unfiltered CCD frames (limiting mag 18.9) on Jan. 8.757 with a 0.25-m f/5 reflector, yielding mag 14.5 and position end figures 08s.77, 50".2.