X-ray Flares in Early GRB Afterglows

Details X-ray Flares in Early GRB Afterglows X-ray Flares in Early GRB Afterglows

2007-01-02

arxiv.org/abs/astro-ph/0701046v1

Phil.Trans.Roy.Soc.Lond.A365:1213-1226,2007

Astronomy and Astrophysics

Astrophysics

Accepted for publication in Philosophical Transactions A. 12 pages

Scientific paper

10.1098/rsta.2006.1970

The Swift X-ray Telescope (XRT) has discovered that flares are quite common in early X-ray afterglows of Gamma-Ray Bursts (GRBs), being observed in roughly 50% of afterglows with prompt followup observations. The flares range in fluence from a few percent to ~ 100% of the fluence of the prompt emission (the GRB). Repetitive flares are seen, with more than 4 successive flares detected by the XRT in some afterglows. The rise and fall times of the flares are typically considerably smaller than the time since the burst. These characteristics suggest that the flares are related to the prompt emission mechanism, but at lower photon energies. We conclude that the most likely cause of these flares is late-time activity of the GRB central engine.

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