Redshifts of a supernova ( SN ) and gamma-ray burst ( GRB ) samples are compared with the pixel temperatures of the Wilkinson Microwave Anisotropy Probe ( WMAP ) seven-years data , the pixels locations corresponding to the SN and GRB sky coordinates .
We have found a statistically significant correlation of the SN redshifts with the WMAP data , the average temperature deviation being +29.9 \pm 4.4 ~ { } \mu { K } for the redshifts z ranging from 0.5 to 1.0 and +8.6 \pm 1.3 ~ { } \mu { K } for z \in ( 0.0 , 0.4 ) .
The latter value accords with the theoretical estimates for the distortion of the cosmic microwave background due to the integrated Sachs-Wolfe effect , whereas the larger anomaly for higher redshifts should be studied in more detail in the future .