@inproceedings{bcf4dd299bb643e49005d77e077d31da,
title = "X-ray flares in the early swift observations of the possible naked burst GRB 050421",
abstract = "We present the Swift observations of the faint burst GRB 050421. The X-ray light-curve shows two flares: the first flare peaking at ∼ 110 s after the BAT trigger (T0) and the second one peaking at ∼154 s. We argue that the mechanism producing these flares is probably late internal shocks. The X-ray light-curve shows a rapid decline with a temporal index α ∼ 3.1. The X-ray source disappears completely less than 1 hour after the trigger. An X-ray spectral softening is also observed with time from β ∼ 0.1 to ∼ 1.2. A good joint fit to the BAT and XRT spectra indicates that the early X-ray and Gamma-ray emissions are produced by the same mechanism. The X-ray spectral softening is likely due to a shift down to lower energies of the peak of the prompt emission, and the rapid decline of the X-ray emission is probably the tail of the prompt emission. This suggests that the X-ray emission is completely dominated by high latitude radiation and the external shock, if any, is below the detection threshold.",
author = "O. Godet and Page, \{K. L.\} and Goad, \{M. R.\} and Beardmore, \{A. P.\} and O'Brien, \{P. T.\} and Osborne, \{J. P.\} and Burrows, \{D. N.\} and M. Capalbi and J. Kennea and V. Mangano and A. Moretti and D. Morris",
year = "2006",
language = "English (US)",
isbn = "9290929154",
series = "European Space Agency, (Special Publication) ESA SP",
number = "604",
pages = "899--900",
booktitle = "X-ray Universe 2005",
edition = "604",
note = "X-ray Universe 2005 ; Conference date: 26-09-2005 Through 30-09-2005",
}