Cobalt-56 decay produced an "afterglow" of these from an emission by supernova SN 1987A.
Although it may be best known for discovering the pulsar Geminga, SAS-2's primary objective was to study these things between energies of 20 to 300 MeV. A 2010 discovery confirmed that the "something" at the heart of the Milky Way is actually two "bubbles" of these that appear as a mirror image of one another. Magnetar giant flares and neutron star/black hole mergers are candidates for progenitors of short duration (*) firing of these, whose long-duration variety is easily explained by collapsars or hypernovae. Cobalt-56 decay produced an "afterglow" of these from an emission by supernova SN 1987A. BeppoSax discovered the production of these events, which usually take 20 to 40 seconds and, at a range of three times the Milky Way's width from Earth could cause a mass extinction event. For 10 points, name this high frequency radiation that occurs as bursts.
Although it may be best known for discovering the pulsar Geminga, SAS-2's
gamma ray bursts