Investigating <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi></mml:math> -ray halos around three HAWC bright sources in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>F</mml:mi><mml:mi>e</mml:mi><mml:mi>r</mml:mi><mml:mi>m</mml:mi><mml:mi>i</mml:mi></mml:math> -LAT data

Numerous extended sources around Galactic pulsars have shown significant $\ensuremath{\gamma}$-ray emission from GeV to TeV energies, revealing hundreds of energy electrons scattering off the underlying photon fields through inverse Compton (ICS). HAWC gamma-ray observations few-degree Geminga and Monogem, LAT Geminga, suggest that systems older than 100 kyr multi-TeV ${e}^{\ifmmode\pm\else\textpm\fi{}}$ propagating beyond SNR-PWN system into interstellar medium. Following discovery few by at energies $\mathrm{E}&gt;100\text{ }\text{ }\mathrm{TeV}$, we investigate presence an in Fermi-LAT data three brightest detected up TeV. We find ${\ensuremath{\theta}}_{68}=1.0{0}_{\ensuremath{-}0.07}^{+0.05}\text{ }\mathrm{deg}$ eHWC J1825-134 ${\ensuremath{\theta}}_{68}=0.71\ifmmode\pm\else\textpm\fi{}0.10\text{ $\mathrm{J}1907+063$. The analysis with ICS templates on point diffusion coefficient values which are significantly lower average one. When studied along data, provide invaluable insight very high-energy electron positron parent populations.