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Twenty years have already been elapsed from the BeppoSAX discovery of the first afterglow of a Gamma-Ray Burst (GRB) in February 28, 1997. Thanks to this discovery, it was possible to unveil the 30 year mystery about GRB origin: GRBs are huge explosions in galaxies at cosmological distances. Starting from the first GRB detection with Vela satellites, I will review the main results obtained before BeppoSAX, the story of the BeppoSAX discovery of the GRB afterglow with the consequent cosmological distance determination, the main BeppoSAX results, and those obtained after the BeppoSAX era until nowadays with the still open problems and prospects.

The key role of BeppoSAX in the GRB history