@inproceedings{a8bcf2a655f240aea8ee3802b9ce287d,
title = "Late-time X-ray flares during GRB afterglows: Extended internal engine activity",
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 > 500× 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.",
author = "Falcone, {A. D.} and Burrows, {D. N.} and P. Romano and S. Kobayashi and D. Lazzati and B. Zhang and S. Campana and G. Chincarini and G. Cusumano and N. Gehrels and P. Giommi and Goad, {M. R.} and O. Godet and Hill, {J. E.} and Kennea, {J. A.} and P. M{\'e}sz{\'a}ros and D. Morris and Nousek, {J. A.} and O'Brien, {P. T.} and Osborne, {J. P.} and C. Pagani and K. Page and G. Tagliaferri",
year = "2006",
month = may,
day = "19",
doi = "10.1063/1.2207925",
language = "English (US)",
isbn = "0735403260",
series = "AIP Conference Proceedings",
pages = "386--391",
booktitle = "GAMMA-RAY BURSTS IN THE SWIFT ERA",
note = "GAMMA-RAY BURSTS IN THE SWIFT ERA: 16th Maryland Astrophysics Conference ; Conference date: 29-11-2005 Through 02-12-2005",
}