2009CBET.2006....1N

S. Nakano, Sumoto, Japan, reports the discovery by Koichi Itagaki (Teppo-cho, Yamagata, Japan) of an apparent supernova (mag 16.0) in NGC 1832 on 15-s unfiltered CCD frames taken on Nov. 6.73 UT using a 0.60-m f/5.7 reflector (limiting magnitude 19.0). T. Yusa (Osaki, Miyagi-ken, Japan) confirmed the new object on seven 120-s unfiltered CCD frames (limiting mag 18.5) taken remotely using a 0.25-m f/3.4 reflector near Mayhill, NM, U.S.A. on Nov. 7.4. K. Kadota (Ageo, Japan) also obtained sixteen 60-s unfiltered CCD images (limiting mag 18.0) on Nov. 7.63 using a 0.25-m f/5 reflector. The available astrometry and magnitudes from these observers are tabulated below for this object, designated 2009kr, with its offsets as measured from the galaxy's center:

---------------------------------------------------------------------------— 2009 UT R.A. (2000.0) Decl. Mag. Offset Observer ---------------------------------------------------------------------------— Nov. 6.730 5 12 03.30 -15 41 52.2 16.0 0".3 W, 35".5 S Itagaki Nov. 7.407 5 12 03.31 -15 41 52.0 15.7 Yusa Nov. 7.626 5 12 03.29 -15 41 52.1 15.6 0".3 W, 36".0 S Kadota ---------------------------------------------------------------------------—

Nothing is visible at this location on Itagaki's many past frames, including his most recent previous frame taken on Oct. 3.76 (limiting mag 18.5), or on the Digitized Sky Survey (DSS), Itagaki noting that his discovery image has been posted at website URL http://www.k-itagaki.jp/images/ngc1832.jpg. Yusa adds that there is nothing visible at the location of 2009kr on a DSS image from 1983 Nov. 6.667 (limiting mag 18.5; no bandpass provided). The type-Ib supernova 2004gq also appeared about 0'.5 northeast of the center of NGC 1832 (cf. IAUCs 8452, 8461).