Question

where do the longer gamma - ray bursts come from?

Explanation:

Long - duration gamma - ray bursts are thought to be associated with the collapse of massive stars (a process called a collapsar). When a very massive star runs out of fuel, its core collapses to form a black hole or a neutron star. Jets of high - energy particles are launched along the star's rotation axis, and these jets interact with the surrounding material, producing the gamma - ray burst.

Answer:

They are associated with the collapse of massive stars.