Evidence for early high-energy afterglow: BATSE observations of GRB980923

Details Evidence for early high-energy afterglow: BATSE observations of GRB980923 Evidence for early high-energy afterglow: BATSE observations of GRB980923

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..526..394g&link_type=abstract

GAMMA-RAY BURSTS: 5th Huntsville Symposium. AIP Conference Proceedings, Volume 526, pp. 394-398 (2000).

Computer Science

2

Cosmic Rays, Gamma-Ray Sources, Gamma-Ray Bursts, Jets And Bursts, Galactic Winds And Fountains

Scientific paper

The relation between the prompt γ-ray emission of a Gamma-Ray Burst (GRB) and its afterglow emission is unclear. We present evidence in the BATSE data for a prompt high-energy (25-300 keV) afterglow component associated with GRB980923 that is initiated during the burst. The event exhibits rapid variability lasting ~40 s, followed by a smooth power-law emission tail lasting ~400 s. The energy spectrum changes abruptly to a cooling synchrotron spectrum when the tail becomes noticeable, consistent with the internal-external shock scenario in the fireball model. This overlap of prompt and afterglow emission illustrates that the external shocks can be generated during the γ-ray emission phase, as also suggested by the simultaneous optical emission of GRB991023. .

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