Limits on fNL parameters from Wilkinson microwave Anisotropy Probe three-year data

We analyse the three-year Wilkinson Microwave Anisotropy Probe data and look for a deviation from Gaussianity in the form of a three-point function that has either of the two theoretically motivated shapes: local and equilateral. There is no evidence of departure from Gaussianity and the analysis gives the currently tightest bounds on the parameters f(NL)(local) and f(NL)(equil) , which define the amplitudes of respectively the local non-Gaussianity and the equilateral non-Gaussianity: - 36 < f(NL)(local) < 100, - 256 < f(NL)(equil) < 332 at 95% C. L.