2009CBET.1676....1D

Further to CBET 1589, A. J. Drake, S. G. Djorgovski, R. Williams, A. Mahabal, and M. J. Graham, California Institute of Technology; M. Catelan, Pontificia Universidad Catolica; E. C. Beshore, S. M. Larson, and R. Hill, Lunar and Planetary Laboratory, University of Arizona; and E. Christensen, Gemini Observatory, report the CRTS discovery of three apparent supernovae in unfiltered Catalina Sky Survey (CSS) images: ----------------------------------------------------------------------— SN 2008 UT R.A. (2000.0) Decl. Mag. Offset ----------------------------------------------------------------------— 2009R Jan. 2.46 11 51 10.62 +24 40 22.5 19.2 2009S Jan. 26.22 09 32 30.11 +17 41 19.8 17.7 17".5 W, 13".0 S 2009T Jan. 30.51 13 51 21.72 +14 08 37.6 16.7 2" N ----------------------------------------------------------------------— The Palomar 1.52-m reflector was used for follow-up photometry with Gunn g, r, and i filters, as listed below when CSS images were not used for the measured magnitudes. Additional magnitudes for 2009R: 2008 June 24.21 UT, [20.4 (CSS); Dec. 6.50, 19.1 (CSS); 2009 Jan. 4.51, g = 19.6, r = 19.73; 29.42, 19.7 (CSS). Additional magnitudes for 2009S: 2008 Dec. 20.36, [20.0 (CSS); 2009 Jan. 29.17, g = 18.15. Additional magnitudes for 2009T: Jan. 31.34, g = 17.3, r = 16.8, i = 16.7.

The apparent host galaxy of 2009R resides in a cluster of galaxies at redshift fit z = 0.13 and has Gunn magnitudes u = 22.9, g = 21.6, r = 21.2, i = 21.0, and z = 21.4. The apparent host galaxy of 2009S, 2MASX J09323134+1741326, has redshift z = 0.049 and Sloan Digital Sky Survey (SDSS) Gunn magnitudes u = 17.9, g = 16.3, r = 15.7, i = 15.4, and z = 15.2. SDSS images indicate that 2009T is associated with an extended host galaxy (SDSS J135121.68+140835.2) with Gunn magnitudes u = 19.5, g = 18.8, r = 18.6, i = 18.4, z = 18.4; additional CSS observations on eleven nights between 2007 Dec. 3 and 2008 Dec. 2 show the apparent host galaxy of 2009T as an unresolved source of constant brightness (mag 18.3). Finding charts, light curves, etc., can be found at the following website URL: http://nesssi.cacr.caltech.edu/catalina/AllSN.html.