Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-11-29
Astronomy and Astrophysics
Astrophysics
33 Pages from LaTex including 7 figures, with aastex. To appear in Astrophysical Journal
Scientific paper
10.1086/338695
I discuss in this paper the phenomenon of post-burst emission in BATSE gamma-ray bursts at energies traditionally associated with prompt emission. By summing the background-subtracted signals from hundreds of bursts, I find that tails out to hundreds of seconds after the trigger may be a common feature of long events (duration greater than 2s), and perhaps of the shorter bursts at a lower and shorter-lived level. The tail component appears independent of both the duration (within the long GRB sample) and brightness of the prompt burst emission, and may be softer. Some individual bursts have visible tails at gamma-ray energies and the spectrum in at least a few cases is different from that of the prompt emission.
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