The Early X-ray Afterglows of Optically Bright and Dark Gamma-Ray Bursts

Yi, Lin

doi:10.1088/1009-9271/6/5/07

Cited by 3 publications

(3 citation statements)

References 20 publications

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“…However, the conclusion is not changed by including short bursts whose numbers are very small. Lin (2006) claimed somewhat different results, but his dark bursts just meant no-detection by the UVOT and in total only 25 Swift GRBs were studied.…”

Section: Dust Extinctionmentioning

confidence: 99%

“…There are other optical-darkness statistics performed on Swift GRBs but using optical non-detection as the dark-burst definition, e.g., Lin (2006) and Balázs et al (2008). The former found no systematic difference in X-ray N H between their "dark" and "bright" groups, totaling 25 GRBs, while the latter came to a contradictory conclusion for a much larger sample.…”

Section: Comparisons With Other Studiesmentioning

confidence: 99%

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Statistical studies of optically dark gamma-ray bursts in theSwiftera

Zheng¹,

Deng²,

Wang³

2009

Res. Astron. Astrophys.

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We compare the properties of optically dark GRBs, defined by the opticalto-X-ray spectral index β OX < 0.5, and normal ones discovered by the Swif t satellite before the year 2008 in a statistical way, using data collected from the literature and online databases. Our sample include 200 long bursts, 19 short bursts, and 10 with measured high redshifts (z 4). The ratio of dark bursts is found to be ∼ 10 − 20%, and is similar between long bursts, short ones, and the high-z sub-sample. The result for long bursts is consistent with both the pre-Swif t sample and studies by other authors on smaller Swif t samples. The existence of dark short GRBs is pointed out for the first time. The X-ray derived hydrogen column densities of dark GRBs clearly prefer large values compared with those of normal bursts. This supports the dust extinction scenario as the main cause of dark GRBs. Other possibilities like very high redshifts and non-standard emission mechanisms are less likely although not fully excluded.

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Section: Dust Extinctionmentioning

confidence: 99%

Section: Comparisons With Other Studiesmentioning

confidence: 99%

Statistical studies of optically dark gamma-ray bursts in theSwiftera

Zheng¹,

Deng²,

Wang³

2009

Res. Astron. Astrophys.

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show abstract

“…Estimates of the fraction vary and likely depend on the sensitivity of the detecting satellite. There is no significant difference observed in the prompt gamma-rays and X-ray afterglows between the optically bright and dark GRBs [83,84]. Observationally, there is not a robust quantity to identify optically bright, dim, and even dark classifications, although some statistical approaches have been suggested [85][86][87][88].…”

Section: Optically Bright Vs Dark Grbsmentioning

confidence: 99%

Gamma-ray bursts in the Swift-Fermi era: Confronting data with theory

Liang

2010

Sci. China Phys. Mech. Astron.

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With the prompt slewing capability of the X-ray and UV-optical telescopes onboard the Swift mission and with the gamma-ray large area telescope onboard the Fermi mission, gamma-ray bursts (GRBs) are now accessible in a full time window and in all electromagnetic wavelengths for the events. Many observational breakthroughs have been made in recent years. I present here a brief review of some observational breakthroughs with the two missions, focusing on how these breakthroughs have revolutionized our understanding of the nature of this phenomenon and puzzles as well as challenges of confronting the conventional models with data. radiation mechanism, gamma rays bursts, high energy phenomenon Swift, a multi-wavelength Gamma-ray burst (GRB) mission [1], has refreshed our understanding of the nature of this phenomenon. The Fermi gamma-ray space telescope now is ushering in a new era of observational astronomy in the energetic gamma-ray band [2], which provides a powerful tool for the study of radiation mechanisms and the physical conditions for GRBs and their afterglows. Here, I present a brief review of the recent progress with the two missions, giving a global view of the observational GRB field. For extensive reviews since the launch of Swift, refer to references [2][3][4][5][6].

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Catastrophe of coronal magnetic rope in partly open multipolar magnetic field

Peng

2005

Chinese Astronomy and Astrophysics

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The Early X-ray Afterglows of Optically Bright and Dark Gamma-Ray Bursts

Abstract: A systematical study on the early X-ray afterglows of both opti-

Cited by 3 publications

References 20 publications

Statistical studies of optically dark gamma-ray bursts in theSwiftera

Statistical studies of optically dark gamma-ray bursts in theSwiftera

Gamma-ray bursts in the Swift-Fermi era: Confronting data with theory

Catastrophe of coronal magnetic rope in partly open multipolar magnetic field

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