An unexpectedly rapid decline in the X-ray afterglow emission of long gamma-ray bursts.

Abstract:

:'Long' gamma-ray bursts (GRBs) are commonly accepted to originate in the explosion of particularly massive stars, which give rise to highly relativistic jets. Inhomogeneities in the expanding flow result in internal shock waves that are believed to produce the gamma-rays we see. As the jet travels further outward into the surrounding circumstellar medium, 'external' shocks create the afterglow emission seen in the X-ray, optical and radio bands. Here we report observations of the early phases of the X-ray emission of five GRBs. Their X-ray light curves are characterised by a surprisingly rapid fall-off for the first few hundred seconds, followed by a less rapid decline lasting several hours. This steep decline, together with detailed spectral properties of two particular bursts, shows that violent shock interactions take place in the early jet outflows.

journal_name

Nature

journal_title

Nature

authors

Tagliaferri G,Goad M,Chincarini G,Moretti A,Campana S,Burrows DN,Perri M,Barthelmy SD,Gehrels N,Krimm H,Sakamoto T,Kumar P,Mészáros PI,Kobayashi S,Zhang B,Angelini L,Banat P,Beardmore AP,Capalbi M,Covino S,Cusuman

doi

10.1038/nature03934

keywords:

subject

Has Abstract

pub_date

2005-08-18 00:00:00

pages

985-8

issue

7053

eissn

0028-0836

issn

1476-4687

pii

nature03934

journal_volume

436

pub_type

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