Investigating the EGRET-radio galaxies link with INTEGRAL: the case of   3EG J1621+8203 and NGC 6251
  The analysis of an INTEGRAL AO2 observation of the error contours of the EGRET source 3EG J1621+8203 is presented. The only source found inside the error contours for energies between 20 and 30 keV at 5 sigma detection significance is the FR I radio galaxy NGC 6251. This supports the identification of NGC 6251 with 3EG J1621+8203. The observed flux is higher and softer than observed in the past, but consistent with a variable blazar-like spectral energy distribution. 
L. Foschini, M. Chiaberge, P. Grandi, I.A. Grenier, M. Guainazzi, W.   Hermsen, G.G.C. Palumbo, J. Rodriguez, S. Chaty, S. C...