HEAD Division Meeting 1999, April 1999
Session 1. Gamma Ray Bursts
Oral, Monday, April 12, 1999, 8:30am-10:04am, Colonial Room

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[1.01] Afterglows: Near and Far

D. A. Frail (National Radio Astronomy Observatory)

Historically, both gamma-ray bursts and soft gamma-ray repeaters were identified on the basis of transient flashes of gamma-ray emission. However, in recent years, substantial progress has been made in understanding the nature of these different phenomena as a result of shorter wavelength observations coupled with keen theoretical insight. For gamma-ray bursts I will show how the discovery of long-lived X-ray, optical and radio afterglows has been used to put constraints on their energetics, geometry, and environment. Similarly, for soft gamma-ray repeaters I will use the properties of the surrounding nebular emission to bolster the now-popular magnetar model.

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