2008CBET.1570....1S

D. Sand, Center for Astrophysics and Las Cumbres Observatory Global Telescope Network; M. L. Graham, University of Victoria; S. Herbert-Fort and D. Just, Steward Observatory; C. Bildfell, C. J. Pritchet, and H. Hoekstra, University of Victoria; and S. Sivanandam and D. Zaritsky, Steward Observatory, report the discovery of five supernovae on g'- and r'-band images obtained at the Canada-France-Hawaii Telescope (+ Megacam). The Megacam photometry given below all have uncertainty within ± 0.1 mag. -----------------------------------------------------------------------— SN 2008 UT R.A. (2000.0) Decl. g' Offset -----------------------------------------------------------------------— 2008hb Sept. 21 22 25 14.03 - 1 43 11.8 21.8 – 2008hc Sept. 21 23 38 27.52 +23 33 44.3 21.6 0".58 E, 1".59 N 2008hd Sept. 24 23 54 07.84 -10 15 43.4 20.2 0".94 W, 0".1 S 2008he Oct. 31 0 19 31.22 +28 51 45.0 22.4 0".90 E, 1".46 N 2008hf Nov. 3 9 19 43.36 -12 14 02.1 21.9 1".38 E, 0".99 S -----------------------------------------------------------------------— No host galaxy is seen for 2008hb (to limiting magnitudes g' about 23.5 and r' about 23.5). The apparent host galaxy for 2008hc has g' = 20.51 ± 0.04 and r' = 19.85 ± 0.04. The apparent host galaxy for 2008hd has g' = 21.61 ± 0.02 and r' = 21.11 ± 0.02. The apparent host galaxy for 2008he has g' = 19.25 ± 0.02 and r' = 18.64 ± 0.03. The apparent host galaxy for 2008hf has g' = 22.88 ± 0.07 and r' = 21.45 ± 0.02. Additional r' magnitudes are tabulated below, together with spectroscopic results. Additional magnitudes for 2008hd on Oct. 27: g' = 22.3, r' = 21.2. Spectroscopic confirmation was obtained with the Blue Channel Spectrograph on the MMT; the publicly available Supernova Identification code of Blondin and Tonry (2007, Ap.J. 666, 1024) was utilized in the analysis. The spectra, finding charts, and discovery images are all available upon request. The spectrum of 2008hd is similar to that of the peculiar type-Ia supernova 2000cx around maximum light. Additional photometry spectroscopy -----------------------------------------------------------------— SN Date UT r' Date 2008 UT Type After z -----------------------------------------------------------------— 2008hb 2008 Sep. 21 21.5 Sept. 30 Ia 0 0.31 2008hc 2008 Sep. 21 21.2 Sept. 30 Ia +10 0.25 2008hd 2008 Sep. 24 20.4 Sept. 30 Ia-p 0 0.08 2008he 2008 Oct. 31 22.1 Nov. 5 Ia -5 0.10 2008hf 2008 Nov. 3 21.5 Nov. 5 Ia -3 0.33 \rule