K Corrections For Type Ia Supernovae and a Test for Spatial Variation of   the Hubble Constant
  Cross-filter K corrections for a sample of "normal" Type Ia supernovae (SNe) have been calculated for a range of epochs. With appropriate filter choices, the combined statistical and systematic K correction dispersion of the full sample lies within 0.05 mag for redshifts z<0.7. This narrow dispersion of the calculated K correction allows the Type Ia to be used as a cosmological probe. We use the K corrections with observations of seven SNe at redshifts 0.3 < z <0.5 to bound the possible difference between the locally measured Hubble constant (H_L) and the true cosmological Hubble constant (H_0). 
A. Kim, S. Deustua, S. Gabi, G. Goldhaber, D. Groom, I. Hook, M. Kim,   J. Lee, R. Pain, C. Pennypacker, S. Perlmutter, I. S...