Late-time observations of the X-ray afterglow of GRB 060729

Dirk Grupe, David Burrows, Xue Feng Wu, Bing Zhang, Gordon Garmire

Research output: Contribution to journalConference article

Abstract

We summarize the results of the late-time Chandra observations of the X-ray afterglow of the Swift-discovered GRB 060729. These Chandra observations have been the latest X-ray detections of an afterglow, even up to 21 month after the trigger. The last two Chandra observations in December 2007 and May 2008 suggest a break at about a year after the burst, implying a jet half-opening angle of about 14 degrees, if interpreted as a jet break. As an alternative this break may have a spectral origin. In that case no jet break was observed and the half-opening angle is larger than 15 degrees for a wind medium. Comparing the X-ray afterglow of GRB 060729 with other bright X-ray afterglows we discuss why the afterglow of GRB 060729 was such an exceptionally long-lasting event. The detection by Chandra in May 2008 was the latest detection of an X-ray afterglow at cosmological distance ever.

Original languageEnglish (US)
JournalProceedings of Science
Volume2012-May
StatePublished - Jan 1 2012
Event2012 Gamma-Ray Bursts Conference, GRB 2012 - Munich, Germany
Duration: May 7 2012May 11 2012

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afterglows
x rays
bursts
actuators

All Science Journal Classification (ASJC) codes

  • General

Cite this

Grupe, D., Burrows, D., Wu, X. F., Zhang, B., & Garmire, G. (2012). Late-time observations of the X-ray afterglow of GRB 060729. Proceedings of Science, 2012-May.
Grupe, Dirk ; Burrows, David ; Wu, Xue Feng ; Zhang, Bing ; Garmire, Gordon. / Late-time observations of the X-ray afterglow of GRB 060729. In: Proceedings of Science. 2012 ; Vol. 2012-May.
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abstract = "We summarize the results of the late-time Chandra observations of the X-ray afterglow of the Swift-discovered GRB 060729. These Chandra observations have been the latest X-ray detections of an afterglow, even up to 21 month after the trigger. The last two Chandra observations in December 2007 and May 2008 suggest a break at about a year after the burst, implying a jet half-opening angle of about 14 degrees, if interpreted as a jet break. As an alternative this break may have a spectral origin. In that case no jet break was observed and the half-opening angle is larger than 15 degrees for a wind medium. Comparing the X-ray afterglow of GRB 060729 with other bright X-ray afterglows we discuss why the afterglow of GRB 060729 was such an exceptionally long-lasting event. The detection by Chandra in May 2008 was the latest detection of an X-ray afterglow at cosmological distance ever.",
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Grupe, D, Burrows, D, Wu, XF, Zhang, B & Garmire, G 2012, 'Late-time observations of the X-ray afterglow of GRB 060729', Proceedings of Science, vol. 2012-May.

Late-time observations of the X-ray afterglow of GRB 060729. / Grupe, Dirk; Burrows, David; Wu, Xue Feng; Zhang, Bing; Garmire, Gordon.

In: Proceedings of Science, Vol. 2012-May, 01.01.2012.

Research output: Contribution to journalConference article

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AB - We summarize the results of the late-time Chandra observations of the X-ray afterglow of the Swift-discovered GRB 060729. These Chandra observations have been the latest X-ray detections of an afterglow, even up to 21 month after the trigger. The last two Chandra observations in December 2007 and May 2008 suggest a break at about a year after the burst, implying a jet half-opening angle of about 14 degrees, if interpreted as a jet break. As an alternative this break may have a spectral origin. In that case no jet break was observed and the half-opening angle is larger than 15 degrees for a wind medium. Comparing the X-ray afterglow of GRB 060729 with other bright X-ray afterglows we discuss why the afterglow of GRB 060729 was such an exceptionally long-lasting event. The detection by Chandra in May 2008 was the latest detection of an X-ray afterglow at cosmological distance ever.

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