  We analyze the additional effect on planetary atmospheres of recently
detected gamma-ray burst afterglow photons in the range up to 1 TeV. For an
Earth-like atmosphere we find that there is a small additional depletion in
ozone versus that modeled for only prompt emission. We also find a small
enhancement of muon flux at the planet surface. Overall, we conclude that the
additional afterglow emission, even with TeV photons, does not result in a
significantly larger impact over that found in past studies.
