Why can cosmic gamma rays point back to their sources more accurately than charged cosmic rays?

Cosmic gamma rays are able to point back to their sources more accurately than charged cosmic rays because they are not affected by magnetic fields.1

While charged cosmic ray particles—such as protons and atomic nuclei—are deflected by galactic and intergalactic magnetic fields during their transit through space, gamma rays are electrically neutral. Because they carry no charge, their paths remain straight, allowing astronomers to trace them directly back to their points of origin, such as supernova remnants or active galaxies. In contrast, the trajectories of charged particles are constantly altered by these magnetic fields, making it difficult to pinpoint their precise sources.12