SIMBAD references

E. Kankare and S. Mattila, Tuorla Observatory; S. Ryder, Anglo-Australian Observatory (AAO); A. Alonso-Herrero, T. Diaz Santos, and L. Colina Instituto de Estructura de la Materia (IEM), Consejo Superior de Investigaciones Cientificas (CSIC); J. Kotilainen, Tuorla Observatory; M.-A. Perez-Torres, Instituto de Astrofisica de Andalucia (IAA), CSIC; P. Vaisanen, South African Astronomical Observatory; A. Alberdi, IAA/CSIC; and A. Efstathiou, European University, Cyprus, report the discovery of an apparent supernova on near- infrared images of the luminous infrared galaxy IRAS 17138-1017 in the course of their infrared search program (cf. IAUCs 8473, 8474; CBET 858). The new object was detected in images obtained using the Altair/NIRI adaptive-optics system with "Laser Guide Star" on the Gemini-North Telescope on Apr. 21.6 and May 27.5 UT, via comparison with NICMOS images obtained with the Hubble Space Telescope (HST) on 2004 Sept. 23.0. SN 2008cs is located at R.A = 17h16m35s.85, Decl. = -10o20'43".0 (equinox 2000.0), which is 0".72 east and 4".19 south of the galaxy's K-band nucleus. Available magnitudes for 2008cs: 2004 Sept. 23.0, J = [22.0 (F110W HST filter; 0.8-1.4 microns); H = 23.0, [21.0 (F160W HST filter; 1.4-1.8 microns); 23.0, K = [18.5 (F187N HST filter; 1.87 microns); 2008 Apr. 21.6, K = 17.0 ± 0.1; May 27.5, K = 16.0 ± 0.1, H = 17.1 ± 0.1. The light curve, absolute magnitude, and H-K color of 2008cs are consistent with a 'slowly declining' core-collapse supernova (Mattila and Meikle 2001, MNRAS 324, 325), similar to SNe 1998S and 1979C, having maximum light near the second-epoch observation and a high extinction of A(V) approximately 15. Infrared and radio follow-up observations of 2008cs are encouraged.