Which of these has NOT been identified as the progenitor of at least some gamma-ray bursts?
A) magnetar
B) a collision of two neutron stars
C) Wolf-Rayet star
D) a collision of two black holes

Question

Quizplus · Accepted Answer

Gamma-ray bursts (GRBs) are extremely energetic explosions observed in distant galaxies, and they have been linked to several astrophysical phenomena, but not to the collision of two black holes. While magnetars (A), collisions of two neutron stars (B), and Wolf-Rayet stars (C) have all been associated with the production of gamma-ray bursts, the collision of two black holes (D) has not been identified as a progenitor of GRBs. This is because the collision of black holes is expected to produce gravitational waves rather than electromagnetic radiation like gamma rays.

Which of These Has NOT Been Identified as the Progenitor