Munar-Adrover, PerePereMunar-AdroverSabatini, S.S.SabatiniPIANO, GiovanniGiovanniPIANOTAVANI, MARCOMARCOTAVANINguyen, L. H.L. H.NguyenLUCARELLI, FabrizioFabrizioLUCARELLIVERRECCHIA, FrancescoFrancescoVERRECCHIAPITTORI, CarlottaCarlottaPITTORI2021-01-072021-01-0720160004-637Xhttp://hdl.handle.net/20.500.12386/29551AGILE discovered the transient source AGL J2241+4454 in 2010, which triggered the study of the associated field allowing for the discovery of the first Be/black hole binary system: MWC 656. This binary was suggested to be the counterpart of AGL J2241+4454, but this association is still not robust. In this work we explore the archival AGILE and Fermi/Large Area Telescope (LAT) data to find more transient events compatible with AGL J2241+4454 and address the possibility to link them to the accretion/ejection processes of MWC 656. We found a total of nine other transient events with AGILE compatible with the position of AGL J2241+4454, besides the 2010 one. We folded these events with the period of the binary system and we could not associate the gamma-ray activity with any particular orbital phase. By stacking the 10 transient events we obtained a spectrum that extends between 100 MeV and 1 GeV, and we fitted it with a power law with a photon index Γ = 2.3 +/- 0.2. We searched the Fermi/LAT data in order to complement the gamma-ray information provided by AGILE but no significant results arose. To investigate this apparent contradiction between these telescopes, we studied the exposure of the field of AGL J2241+4454 in both instruments, and found significant differences. In particular, AGILE exposed, for a longer time and at a lower off-axis angular distance, the field of AGL J2241+4454. This fact, together with the energy-dependent sensitivity of both instruments, and the soft spectrum found in the stacking analysis, might explain why AGILE observed the transient events not seen by Fermi/LAT.STAMPAenArticle10.3847/0004-637X/829/2/1012-s2.0-84990922602000385377200043https://iopscience.iop.org/article/10.3847/0004-637X/829/2/1012016ApJ...829..101MFIS/05 - ASTRONOMIA E ASTROFISICA