  Elsaesser and Mannheim fit a contribution of Dark Matter Annihilation (DMA)
to the extragalactic contribution of the galactic diffuse gamma ray flux, as
deduced from the EGRET data by Strong, Moskalenko and Reimer.They find a WIMP
mass of 515{+110}{-75} GeV and quote a systematic error of 30\%. However, they
do not include large systematic uncertainties from the fact that the
determination of the extragalactic flux (EGF) requires a model for the
subtraction of the Galactic flux from the data.The data used were obtained with
a model without Galactic DM, so one expects additional uncertainty in the
region where DMA contributes. Including a Galactic DMA contribution reduces the
significance and the WIMP mass. The latter then becomes compatible with the
Galactic excess of diffuse gamma rays, which posseses all the properties of DMA
with a much higher significance than the extragalactic excess.

Astrophysics