The Mystery: What and where are the gamma-ray burst sources?

The grids below show the entire sky as seen from Earth.

What Astronomers Expected to Find: Before the Compton Observatory
If gamma-ray bursts had come from known stars in our galaxy, the bursts should have been concentrated along the plane of the Milky Way, as shown in this map:
Before the Compton Observatory
What Astronomers Found: Using the Compton Observatory
Instead, the gamma-ray bursts mapped by the observatory's BATSE instrument were distributed equally in all directions. Thus, they don't come from known galactic objects. So where do astronomers think the bursts come from?
Using the Compton Observatory

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