2010CBET.2145....1M

S. Mattila, Tuorla Observatory; and E. Kankare, Nordic Optical Telescope, report the discovery on near-infrared images of a second apparent supernova (cf. CBET 2144), designated 2010P, in the luminous infrared galaxy Arp 299 (= NGC 3690 + IC 694). The new object was detected via image-subtraction techniques in near-infrared images obtained using NOTCAM on Jan. 18.2 and 23.1 UT, and in an I-band image obtained using STANCAM on Jan. 23.1 on the Nordic Optical Telescope. SN 2010P is located at R.A = 11:28:31.38, Decl. = +58:33:49.3 (equinox 2000.0), which is 6".2 east and 0".3 north of the K-band nucleus 'C' of Arp 299. Nothing is visible at this position on NOTCAM K_s-band images taken on 2009 Nov. 27.2 (limiting mag 17.5). Approximate magnitudes for 2010P: 2010 Jan. 18.2, J = 17.3, H = 16.7, K_s = 16.1; 2010 Jan. 23.1, I = 18.3, J = 16.8, H = 16.2, K_s = 15.9. The light curve, absolute magnitude, and colors of 2010P are consistent with a core-collapse supernova (Mattila and Meikle 2001, MNRAS 324, 325) with a likely extinction of about five magnitudes in V. Infrared and radio follow-up observations of 2010P are encouraged.