Delayed Hard Photons from Gamma-Ray Bursts
Abstract
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 π0. The required cloud density is 2 × 1011 cm-3. This cloud may be the remains of the disrupted envelope of a neutron star, and may survive as an excretion disc of 1014--1015 cm radius around the coalescing binary.
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