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The angular extension of the gamma-ray image of 3C 279 may be constrained bystudying its solar occultations as suggested by Fairbairn et al. (2010). Weperform this kind of analysis for seven occultations observed by Fermi-LAT in2008-2014, using the Fermi-LAT Solar System tools. The results are interpretedin terms of models with extended gamma-ray halo of 3C 279; first constraints onthe size and the flux of the halo are reported.

Constraining the extension of a possible gamma-ray halo of 3C 279 from 2008-2014 solar occultations