X-ray flares in the early swift observations of the possible naked burst GRB 050421

O. Godet, K. L. Page, M. R. Goad, A. P. Beardmore, P. T. O'Brien, J. P. Osborne, David Nelson Burrows, M. Capalbi, Jamie A. Kennea, V. Mangano, A. Moretti, D. Morris

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.

Original languageEnglish (US)
Title of host publicationX-ray Universe 2005
Pages899-900
Number of pages2
Volume2
Edition604
StatePublished - 2006
EventX-ray Universe 2005 - Madrid, Spain
Duration: Sep 26 2005Sep 30 2005

Other

OtherX-ray Universe 2005
CountrySpain
CityMadrid
Period9/26/059/30/05

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

Fingerprint Dive into the research topics of 'X-ray flares in the early swift observations of the possible naked burst GRB 050421'. Together they form a unique fingerprint.

Cite this