2009CBET.1766....1D

A. J. Drake, S. G. Djorgovski, A. Mahabal, R. Williams, and M. J. Graham, California Institute of Technology; M. Catelan, Pontificia Universidad Catolica de Chile; E. C. Beshore and S. M. Larson, Lunar and Planetary Laboratory, University of Arizona; and E. Christensen, Gemini Observatory, report the discovery via the Catalina Real-time Transient Survey (cf. CBETs 1523, 1760) of numerous additional supernovae in unfiltered Catalina Sky Survey images. Spectroscopic follow-up was carried out with the 5.1-m Palomar Hale telescope (+ DBSP) on 2008 Oct. 1, 2009 Feb. 25, and Apr. 1 UT. Spectroscopic classification was done with the aid of the Supernova Identification code of Blondin and Tonry (2007, Ap.J. 666, 1024). The confirmed supernovae below are all type-Ia events except for 2009de (possibly type Ic), 2009dh (type IIp), and 2009di (type Ic).

---------------------------------------------------------------------------— SN 2008 UT R.A. (2000.0) Decl. Mag. Offset z ---------------------------------------------------------------------------— 2008iw Sep. 21.35 23 06 20.03 + 9 40 37.6 19.3 – 0.11 2008ix Oct. 1.32 0 37 04.77 - 6 09 39.2 19.0 – 0.09 ---------------------------------------------------------------------------—

---------------------------------------------------------------------------— SN 2009 UT R.A. (2000.0) Decl. Mag. Offset z ---------------------------------------------------------------------------— 2009de Jan. 2.52 13 00 37.49 +17 50 57.0 18.8 – 0.14 2009df Mar. 1.51 16 05 52.67 +17 24 45.5 18.6 0".3 W, 0."4 N 0.12 2009dg Mar. 3.32 11 33 44.93 +14 34 47.9 19.5 – 0.09 2009dh Mar. 3.43 13 58 19.38 +20 10 51.1 18.8 0".4 W, 0".6 N 0.06 2009di Mar. 21.26 11 36 57.86 +45 00 50.7 18.6 0".4 E, 0".5 N 0.13 2009dj Mar. 24.34 13 58 34.75 +31 12 52.3 19.1 0".9 E, 0".1 N 0.12 2009dk Apr. 1.29 11 30 23.64 + 2 14 35.2 19.5 – 0.08 ---------------------------------------------------------------------------—

SN 2009de was initially designated as PSN K0901-1 on CBET 1682. No clear host galaxy is seen in past images from various surveys covering the fields of 2008iw, 2009de, 2009dg, and 2009dk. In addition, 2009bx (cf. CBET 1744) was found to be a type-Ia supernova at redshift z = 0.07 in Palomar 5.1-m telescope observations.