SIMBAD references

D. Sand, Harvard-Smithsonian Center for Astrophysics (CfA) and Las Cumbres Observatory Global Telescope Network; M. L. Graham and C. Bildfell, University of Victoria; D. W. Just, S. Herbert-Fort, and S. Sivanandam, Steward Observatory; C. J. Pritchet, University of Victoria; H. Hoekstra, Leiden University; and D. Zaritsky, Steward Observatory, report that two more type-Ia supernovae (cf. CBET 1864) were discovered on g'- and r'-band images obtained at the Canada-France-Hawaii Telescope (+ Megacam). Spectroscopic confirmation was obtained with GMOS-N on the Gemini telescope. The publicly available Supernova Identification code of Blondin and Tonry (2007, Ap.J. 666, 1024) was utilized for determining spectroscopic types, indicating that 2009hb was around two months past maximum on June 16 and 2009hc was around three months past maximum on June 18. The objects' discovery magnitudes and spectroscopic redshift (z) are tabulated below:

---------------------------------------------------------------------------— SN 2009 UT R.A. (2000.0) Decl. g' r' z ---------------------------------------------------------------------------— 2009hb Apr. 23 15 22 29.65 +28 04 48.4 20.7 20.5 0.20 2009hc May 23 22 50 26.33 +10 54 41.7 23.0 22.4 0.08 ---------------------------------------------------------------------------—

Additional magnitudes for 2009hb: May 22 UT, g' = 22.8, r' = 21.8. Additional magnitudes for 2009hc: June 17, g' = 23.4, r' = 23.1. Neither 2009hb nor 2009hc apparently has a visible host galaxy down to magnitudes g' about 24.0 and r' about 24.0. Further imaging will be obtained of 2009hc once it has faded, and 2009hc is likely associated with the galaxy cluster Abell 2495 (z = 0.078), being 100" (148 kpc) from the cluster's "brightest cluster galaxy"; pending further deep imaging, 2009hc is likely either a genuine intracluster supernova (e.g., Gal-Yam et al. 2003, A.J. 125, 1087) or is hosted by an extremely faint cluster member.