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V. Connaughton, M. S. Briggs, R. M. Kippen, R. D. Preece (University of Alabama in Huntsville), T. W. Giblin (College of Charleston)
Observations of the afterglow of gamma-ray burst GRB 991216 have been reported at wavelengths from radio to the X-ray band. BATSE observations at energies above 20 keV show intense prompt emission lasting about 40 s followed by a long tail which persists at least 1000 s beyond that time. We present temporal and spectral characteristics of both the prompt and extended emission, and explore whether the tail might be the gamma-ray signature of the afterglow.