Alternative interpretation of the KT boundary and dionsaur die-off

Consider this URL

http://www.pbs.org/wgbh/nova/gamma/milkyway2.html

Could some die-offs be due to the Earth intercepting gamma ray bursts
from nearby neutron star pairs?

How much of the evideence of a KT type event could be produced by
gamma ray bursts?

What distinguishing features would a gama ray burst die off have that
a asteroid impact would not have?

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