We also point out that there will be an ${\cal O}(1)$ reduction of the observed signal flux due to the fraction of the time the satellite is facing away from the sun. Given the assumption that at least part of the excess positron flux does arise from mediator decays, this leads to a [*minimal*]{} predicted gamma flux due to the accompanying final state radiation. The typical spectrum of photons resulting from this process would be $(\alpha/\pi )dE/E$, and thus the photon flux will generally be no less than 0.1% of the electron and positron flux, and one infers the following target photon flux: \^[min]{}\_(E&gt;10   [GeV]{}) 10\^[-7]{} - 10\^[-9]{}  [cm]{}\^[-2]{} [s]{}\^[-1]{}. \[interesting2\] Thus, while it is possible that the hypothesis of a local origin for the flux anomalies can be directly tested with timing and directional information, it also appears that existing EGRET data [@egret; @Strong] may already probe the larger range of this associated gamma flux, while it is feasible that Fermi-LAT will be able to cover the entire range of possible fluxes, with a potential $10^{-9} ~{\rm cm}^{-2} {\rm s}^{-1} $ level sensitivity to multi-GeV gamma rays originating from point sources within a year.

3. Secluded models vs $\gamma$-rays 