Early multi-wavelength emission from gamma-ray bursts: from gamma-ray to x-ray
Reads0
Chats0
TLDR
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
Citations
More filters
Journal ArticleDOI
Magnetars in Ultra-Long Gamma-Ray Bursts
B. P. Gompertz,A. S. Fruchter +1 more
TL;DR: In this article, the authors investigated the broadband observations of ULGRB 111209A and found two independent measures that suggest a high density circumburst environment, however, the light curve of the GRB afterglow shows no evidence of a jet break (the steep decline that would be expected as the jet slows due to the resistance of the external medium).
Journal ArticleDOI
Nonthermal Synchrotron Radiation from Gamma-Ray Burst External Shocks and the X-Ray Flares Observed with Swift
TL;DR: In this paper, an analysis of the interaction between a relativistic blast-wave shell and a stationary cloud with a spherical cap geometry is performed assuming that the cloud width is larger than the distance of the cloud from the gamma-ray burst (GRB) explosion center.
Journal ArticleDOI
Magnetars in Ultra-Long Gamma-Ray Bursts and GRB 111209A
B. Gompertz,A. Fruchter +1 more
Journal ArticleDOI
A new luminosity relation for gamma-ray bursts and its implication
TL;DR: In this paper, the X-ray emission of GRBs observed by Swift has the exponential functional form in the prompt phase and relaxes to a power-law decay at time Tp.
Journal ArticleDOI
A new luminosity relation for gamma-ray bursts and its implication
TL;DR: In this article, the authors explored the correlations in the X-ray emission of gamma-ray bursts (GRBs) and discussed the implications of the luminosity relation, especially on the time duration of GRBs and their classification.
References
More filters
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.
Related Papers (5)
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