Ba a bayyana ba idan kowane tauraro a cikin Milky Way yana da halayen da suka dace don samar da fashewar gamma-ray. Tsarin tauraron tauraro mai yiwuwa ba ya bayyana duk nau'ikan fashewar gamma-ray. Akwai tabbaci mai ƙarfi cewa wasu fashewar gamma-ray na ɗan gajeren lokaci suna faruwa ne a cikin tsarin da ba a samar da taurari ba kuma ba taurari masu yawa ba, kamar su galaxies elliptical da galaxy halos. Ka'idar da aka fi so don mafi yawan gajeren fashewar gamma-ray shine haɗuwa da tsarin tauraron farko wanda ya ƙunshi taurari biyu.
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