Delayed Hard Photons from Gamma-Ray Bursts

Details Delayed Hard Photons from Gamma-Ray Bursts Delayed Hard Photons from Gamma-Ray Bursts

1994-05-13

arxiv.org/abs/astro-ph/9405033v1

Astronomy and Astrophysics

Astrophysics

9 pp., Tex, WU-JIK-94-2

Scientific paper

10.1086/187503

The delayed hard (up to 25 GeV) photons observed more than an hour following a gamma-ray burst on February 17, 1994 may result from the collisions of relativistic nucleons with a dense cloud, producing $\pi^0$. The required cloud density is $\sim 2 \times 10^{11}$ cm$^{-3}$. This cloud may be the remains of the disrupted envelope of a neutron star, and may survive as an excretion disc of $\sim 10^{14}$--$10^{15}$ cm radius around the coalescing binary.

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