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Title: Late-time X-ray flares during GRB afterglows: extended internal engine activity
Authors: Falcone, Abraham D.
Burrows, David N.
Romano, Patrizia
Kobayashi, Shiho
Lazzati, D.
Zhang, B.
Campana, Sergio
Chincarini, Guido
Cusumano, Giancarlo
Gehrels, Neil
Giommi, Paolo
Goad, Michael R.
Godet, Olivier
Hill, Joanne E.
Kennea, Jamie A.
Mészáros, P.
Morris, David C.
Nousek, John A.
O'Brien, Paul T.
Osborne, Julian P.
Pagani, Claudio
Page, Kim L.
Tagliaferri, Gianpiero
Swift XRT Team
First Published: 2006
Publisher: X-ray and Observational Astronomy
Citation: To appear in the proceedings of the 16th Annual October Astrophysics Conference in Maryland "Gamma Ray Bursts in the Swift Era"
Abstract: Observations of gamma ray bursts (GRBs) with Swift produced the initially surprising result that many bursts have large X-ray flares superimposed on the underlying afterglow. These flares were sometimes intense, rapid, and late relative to the nominal prompt phase. The most intense of these flares was observed by XRT with a flux >500x the afterglow. This burst then surprised observers by flaring again after >10000 s. The intense flare can be most easily understood within the context of the standard fireball model, if the internal engine that powers the prompt GRB emission is still active at late times. Recent observations indicate that X-ray flares are detected in ∼1/3 of XRT detected afterglows. By studying the properties of the varieties of flares (such as rise/fall time, onset time, spectral variability, etc.) and relating them to overall burst properties, models of flare production and the GRB internal engine can be constrained.
Type: Conference Paper
Description: Also available via
Appears in Collections:Conference Papers & Presentations, Dept. of Physics and Astronomy

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