Swift X-ray afterglows: Where are the X-ray jet breaks?

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We examine the Swift/X-ray Telescope (XRT) light curves from the first ∼ 150 Gamma-Ray Burst (GRB) afterglows. Although we expected to find jet breaks at typical times of 1-2 days after the GRB, we find that these appear to be extremely rare. Typical light curves have a break in the slope at about 104 s, followed by a single power law decay whose slope is much too shallow to be consistent with expectations for jet breaks. X-ray light curves typically extend out to ∼ 10 days without any further breaks, until they become too faint for the XRT to detect. In some extreme cases, light curves extend out to more than two months without evidence for jet breaks. This raises concerns about our understanding of afterglow and jet dynamics, and of GRB energetics.

Original languageEnglish (US)
Pages (from-to)1273-1287
Number of pages15
JournalNuovo Cimento della Societa Italiana di Fisica B
Volume121
Issue number10-11
DOIs
StatePublished - Oct 1 2006

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afterglows
light curve
gamma ray bursts
x rays
telescopes
slopes
decay

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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title = "Swift X-ray afterglows: Where are the X-ray jet breaks?",
abstract = "We examine the Swift/X-ray Telescope (XRT) light curves from the first ∼ 150 Gamma-Ray Burst (GRB) afterglows. Although we expected to find jet breaks at typical times of 1-2 days after the GRB, we find that these appear to be extremely rare. Typical light curves have a break in the slope at about 104 s, followed by a single power law decay whose slope is much too shallow to be consistent with expectations for jet breaks. X-ray light curves typically extend out to ∼ 10 days without any further breaks, until they become too faint for the XRT to detect. In some extreme cases, light curves extend out to more than two months without evidence for jet breaks. This raises concerns about our understanding of afterglow and jet dynamics, and of GRB energetics.",
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Swift X-ray afterglows : Where are the X-ray jet breaks? / Burrows, David Nelson; Racusin, J.

In: Nuovo Cimento della Societa Italiana di Fisica B, Vol. 121, No. 10-11, 01.10.2006, p. 1273-1287.

Research output: Contribution to journalArticle

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T1 - Swift X-ray afterglows

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