Early multi-wavelength emission from gamma-ray bursts: from gamma-ray to x-ray
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The early high-energy emission from both long and short gamma-ray bursts (GRBs) has been revolutionized by the Swift mission as discussed by the authors, which showed that the non-thermal x-ray emission transitions smoothly from the prompt phase into a decaying phase regardless of the details of the light curve.Abstract:
The study of the early high-energy emission from both long and short gamma-ray bursts (GRBs) has been revolutionized by the Swift mission. The rapid response ofSwiftshows that the non-thermal x-ray emission transitions smoothly from the prompt phase into a decaying phase whatever the details of the light curve. The decay is often categorized by a steep-to-shallow transition suggesting that the prompt emission and the afterglow are two distinct emission components.InthoseGRBswithaninitiallysteeplydecayingx-raylightcurve,we are probably seeing off-axis emission due to termination of intense central engine activity. This phase is usually followed, within the first hour, by a shallow decay, giving the appearance of a late-emission hump. The late-emission hump can last for up to a day, and hence, although faint, is energetically very significant. The energy emitted during the late-emission hump is very likely due to the forward shock being constantly refreshed by either late central engine activity or less relativistic material emitted during the prompt phase. In other GRBs, the early x-ray emission decays gradually following the prompt emission with no evidence for early temporal breaks, and in these bursts the emission may be dominated by classical afterglow emission from the external shock as the relativistic jet is slowed by interaction with the surrounding circum-burst medium. At least half of the GRBs observed by Swift also show erratic x-ray flaring behaviour, usually within the first few hours. The properties of the x-ray flares suggest that they are due to central engine activity. Overall, the observed wide variety of early high-energy phenomena pose a major challenge to GRB models.read more
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Using Swift observations of prompt and afterglow emission to classify GRBs.
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TL;DR: In this paper, a small soft X-ray telescope (XIAO) is proposed as an Italian contribution to the SVOM mission, with effective area of ~120 cm2 and a short focal length, coupled with a very compact, low noise, fast read out CCD camera.
Proceedings ArticleDOI
XIAO: a soft X-ray telescope for the SVOM Mission
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TL;DR: In this paper, a small soft X-ray telescope (XIAO) is proposed as an Italian contribution to the SVOM mission, which can substantially contribute to the overall SVOM capabilities for both GRB and non-GRB science.
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TL;DR: A Thesis Submitted in Partial Fulfillment of the Requirements for the Degree of Master of Science in Physics was submitted in this article, where the degree was described as follows:
References
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Journal ArticleDOI
The Swift Gamma-Ray Burst Mission
Neil Gehrels,G. Chincarini,G. Chincarini,Paolo Giommi,Keith O. Mason,John A. Nousek,Alan A. Wells,Nicholas E. White,S. D. Barthelmy,David N. Burrows,L. R. Cominsky,Kevin Hurley,F. E. Marshall,Peter Mészáros,Peter W. A. Roming,Lorella Angelini,Lorella Angelini,L. M. Barbier,Tomaso Belloni,Sergio Campana,P. A. Caraveo,M. M. Chester,O. Citterio,T. L. Cline,Mark Cropper,Jay Cummings,Jay Cummings,A. J. Dean,Eric D. Feigelson,E. E. Fenimore,Dale A. Frail,A. S. Fruchter,Gordon P. Garmire,Keith C. Gendreau,Gabriele Ghisellini,Jochen Greiner,Joanne E. Hill,S. D. Hunsberger,Hans A. Krimm,Hans A. Krimm,Shrinivas R. Kulkarni,Pawan Kumar,F. Lebrun,Nicole M. Lloyd-Ronning,Craig B. Markwardt,Craig B. Markwardt,Barbara J. Mattson,Barbara J. Mattson,Richard Mushotzky,Jay P. Norris,J. P. Osborne,Bohdan Paczynski,David Palmer,H.-S. Park,A. M. Parsons,J. A. Paul,Martin J. Rees,Christopher S. Reynolds,James E. Rhoads,T. P. Sasseen,Bradley E. Schaefer,A. Short,Alan P. Smale,Alan P. Smale,Ian Smith,Luigi Stella,Gianpiero Tagliaferri,Tadayuki Takahashi,Makoto Tashiro,Leisa K. Townsley,Jack Tueller,Martin J. L. Turner,M. Vietri,Wolfgang Voges,Martin Ward,Richard Willingale,F. M. Zerbi,W. W. Zhang +77 more
TL;DR: The Swift mission as discussed by the authors is a multi-wavelength observatory for gamma-ray burst (GRB) astronomy, which is a first-of-its-kind autonomous rapid-slewing satellite for transient astronomy and pioneers the way for future rapid-reaction and multiwavelength missions.
Journal ArticleDOI
Spectra and light curves of gamma-ray burst afterglows
TL;DR: In this paper, the broadband spectrum and corresponding light curve of synchrotron radiation from a power-law distribution of electrons in an expanding relativistic shock were calculated for the gamma-ray burst afterglow.
Journal ArticleDOI
BATSE observations of gamma-ray burst spectra. I: Spectral diversity
James L. Matteson,L. Ford,B. E. Schaefer,D. M. Palmer,Bonnard J. Teegarden,T. L. Cline,Michael S. Briggs,W. S. Paciesas,G. N. Pendleton,Gerald J. Fishman,Chryssa Kouveliotou,C. A. Meegan,Robert W. Wilson,P. Lestrade +13 more
TL;DR: In this paper, the authors studied the time-averaged gamma-ray burst spectra accumulated by the spectroscopy detectors of the Burst and Transient Source Experiment (BTSE).
Journal ArticleDOI
The Swift X-ray telescope
David N. Burrows,Joanne E. Hill,John A. Nousek,J. A. Kennea,Alan A. Wells,J. P. Osborne,A. F. Abbey,A. P. Beardmore,K. Mukerjee,A. Short,Guido Chincarini,Sergio Campana,Oberto Citterio,Alberto Moretti,C. Pagani,Gianpiero Tagliaferri,Paolo Giommi,M. Capalbi,F. Tamburelli,Lorella Angelini,Giancarlo Cusumano,Heinrich Bräuninger,Wolfgang Burkert,Gisela Hartner +23 more
TL;DR: The Swift Gamma-Ray Explorer (XRT) as mentioned in this paper uses a mirror set built for JET-X and an XMM-Newton/EPIC MOS CCD detector to provide a sensitive broad-band (0.2-10 keV) X-ray imager with effective area of > 120 cm2 at 1.5 keV, field of view of 23.6 × 23. 6 arcminutes, and angular resolution of 18 arcseconds.
Journal ArticleDOI
Collapsars: Gamma-ray bursts and explosions in 'failed supernovae'
Andrew MacFadyen,Stan Woosley +1 more
TL;DR: In this paper, the authors explore the continued evolution of rotating helium stars, Mα 10 M☉, in which iron-core collapse does not produce a successful outgoing shock but instead forms a black hole of 2-3 Mˉ.
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