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Technically that article is about a GRB - which is a result of matter falling into a black hole. This causes radiation and super-high velocity matter being pushed away from outside the event horizon near the poles. We have not witnessed a black hole exploding as all natural black holes are of such a high mass that - even taking into account Hawking radiation - they are still gaining mass/energy from background heat of universe. Black holes will only start being net radiators way way into the cold dark heat death of our expanding universe - and after many more times the current lifetime of the universe some will get so small that they annihilate in the sudden burst of gamma radiation that is described above