2009CBET.1969....1N

Independent discoveries of a supernova in NGC 918 have been received, first via S. Nakano, Sumoto, Japan, who reports the discovery by K. Itagaki (Teppo-cho, Yamagata) of an apparent supernova (mag 17.2) on ten or more 15-s unfiltered CCD frames (limiting mag 19.5) taken around Oct. 11.69 UT using a 0.60-m f/5.7 reflector, noting that nothing is visible at the new object's position (tabulated below) on the Digitized Sky Survey. Itagaki's discovery image is posted at website URL http://www.k-itagaki.jp/images/ngc918.jpg. Nakano also forwards confirming astrometry from T. Yusa (Osaki, Miyagi-ken, Japan), from five 120-s unfiltered CCD exposures (limiting magnitude 19.5) taken remotely using a 0.25-m f/3.4 reflector near Mayhill, NM, U.S.A., as tabulated below. An independent discovery of 2009js was then received by X. Parisky, S. B. Cenko, W. Li, and A. V. Filippenko, University of California, on unfiltered LOSS/KAIT images (cf. CBET 1963), as also tabulated below. Available astrometry and unfiltered CCD magnitudes for 2009js:

---------------------------------------------------------------------------— 2009 UT R.A. (2000.0) Decl. Mag. Offset Observer ---------------------------------------------------------------------------— Oct. 11.44 2 25 48.28 +18 29 25.8 17.2 35".5 W, 20".7 S KAIT 11.689 2 25 48.30 +18 29 26.2 17.2 35" W, 20".5 S Itagaki 12.172 2 25 48.30 +18 29 25.8 16.7 Yusa 12.527 2 25 48.29 +18 29 26.2 17.2 Itagaki ---------------------------------------------------------------------------—

Additional unfiltered CCD magnitudes for 2009js (including limiting magnitudes from archival images): 2007 Aug. 23, [19.0 (Itagaki); 2009 Sept. 24.67, [18.5 (Itagaki); 30.44, [18.9 (KAIT); Oct. 12.44, 17.3.