Download or read book Analysis of Gamma Ray Burst Spectra with Cyclotron Lines written by and published by . This book was released on 1990 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Motivated by the recent developments in the cyclotron resonance upscattering of soft photons or CUSP model of Gamma Ray Burst (GRB) continuum spectra, we revisit a select database of GRBs with credible cyclotron absorption features. We measure the break energy of the continuum, the slope below the break and deduce the soft photon energy or the electron beam Lorentz factor cutoff. We study the correlation (or lack of) between various parameters in the context of the CUSP model. One surprise result is that there appears to be marginal correlation between the break energy and the spectral index below the break. 20 refs., 8 figs., 2 tabs.
Download or read book Gamma ray Bursts written by Cheng Ho and published by Cambridge University Press. This book was released on 1992-03-12 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summarizes the current understanding of Astronomical gamma-ray bursts, short-lived flashes of high-energy radiation, which have eluded even a basic explanation for over twenty years, and describes directions for future research.
Download or read book Problems in the Analysis of Gamma ray Burst Spectra written by and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Spectral measurements by the Solar Maximum Mission have been used to confirm the cyclotron lines in gamma-ray bursts reported from the Konus experiment. We present ISEE-3 data for the same burst (GB800419) during the same period of time which show no line. We discuss various problems in the analysis of scintillator spectra and point out that unfolded spectra are not necessarily unique and that the position of a data point in a deconvolved spectrum may vary depending on the assumed overall shape of the spectrum. As a result, if the analysis assumes a soft spectrum (such as optically thin thermal bremsstrahlung) an absorption feature might appear, whereas a harder spectrum (such as a Comptonized blackbody) would not require the feature. Since the continuum shape probably changes during the duration of a typical burst, the nonuniqueness of the spectral unfolding, combined with the assumption that the continuum is optically thin thermal bremsstrahlung, could give rise to spurious absorption features which vary on a time scale of seconds. Despite these problems, there is still some evidence for narrow spectral lines in the range 45 to 65 keV but not for the broad lines reported from the Konus experiment. Unfortunately, the range 45 to 65 keV is the most difficult spectral region to unfold.
Download or read book A Study of the Temporal and Spectral Characteristics of Gamma Ray Bursts written by Jay Preston Norris and published by . This book was released on 1983 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gamma ray Bursts written by Gerald J. Fishman and published by American Institute of Physics. This book was released on 2000-04-14 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation Proceedings of the Second Huntsville Gamma-Ray Burst Workshop, held in Huntsville, Alabama, October 1993. Papers are grouped in thematic sections, some with subsections: general observations and global studies (general burst observations/intensity distributions and isotropy measures/studies of and searches for burst repetition and clustering); temporal studies; spectral studies; burst localizations and searches for counterparts (burst localization/counterpartsgeneral/optical counterparts/x-ray counterparts/very high energy counterpart searches/soft gamma-ray repeaters--counterparts); burst origins and emission processes--theory (cosmological models/galactic models/soft gamma-ray repeaters--theory); instrumentation and new analysis techniques; and miscellaneous. No index. Annotation c. by Book News, Inc., Portland, Or.
Download or read book Continuum Spectra for Gamma ray Bursts written by and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Gamma-ray bursts are observed to have very steep spectra below photon energy /approximately/100 keV; some have photon number spectra as steep as F /proportional to/ E/sup 0/. This property has been difficult to explain in terms of most radiation processes. The BATSE experiment on the Gamma Ray Observatory should be able to test how common this spectral property is and whether there are bursts with even steeper low-energy spectra. To explain this spectral steepness, we study a model in which the /gamma/ radiation is produced by inverse-Compton and cyclotron scattering of blackbody radiation from the surface of a neutron star by relativistic electrons. If the neutron star has negligible magnetic field, Compton scattering dominates in producing the observed gamma-ray burst spectra. If the field exceeds 10/sup 10/ G, cyclotron scattering is more important. In the low-magnetic-field case, steep spectra may be produced via the suppression of the low energy part of the ''cooling spectrum'' (the spectrum integrated over the radiation lifetime of an electron), as a result of the smaller and more collimated photon flux an electron sees as it moves away from the neutron star. In the high-magnetic-field case, low-energy suppression occurs because electrons with higher energies scatter the blackbody photons more efficiently due to the cyclotron resonance, preferentially producing high energy photons. 27 refs., 5 figs.
Download or read book Line and Continuum Spectroscopy as Diagnostic Tools for Gamma Ray Bursts written by and published by . This book was released on 1990 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: We review the theoretical framework of both line and continuum spectra formation in gamma ray bursts. These include the cyclotron features at 10's of keV, redshifted annihilation features at (approximately)400 keV, as well as other potentially detectable nuclear transition lines, atomic x-ray lines, proton cyclotron lines and plasma oscillation lines. By combining the parameters derived from line and continuum modeling we can try to reconstruct the location, geometry and physical conditions of the burst emission region, thereby constraining and discriminating the astrophysical models. Hence spectroscopy with current and future generations of detectors should provide powerful diagnostic tools for gamma ray bursters. 48 refs., 10 figs., 4 tabs.
Download or read book Multiwavelength Constraints on Gamma ray Burst Sources written by Dieter H. B. Hartmann and published by . This book was released on 1989 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spectral Properties of Gamma ray Bursts Observed by the Burst and Transient Source Experiment written by Lyle A. Ford and published by . This book was released on 1996 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Physics of Gamma Ray Bursts written by Bing Zhang and published by Cambridge University Press. This book was released on 2018-12-13 with total page 617 pages. Available in PDF, EPUB and Kindle. Book excerpt: A complete text on the physics of gamma-ray bursts, the most brilliant explosions since the Big Bang.
Download or read book Gamma Ray Bursts written by Gilbert Vedrenne and published by Springer Science & Business Media. This book was released on 2009-03-20 with total page 613 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since their discovery was first announced in 1973, gamma-ray bursts (GRBs) have been among the most fascination objects in the universe. While the initial mystery has gone, the fascination continues, sustained by the close connection linking GRBs with some of the most fundamental topics in modern astrophysics and cosmology. Both authors have been active in GRB observations for over two decades and have produced an outstanding account on both the history and the perspectives of GRB research.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of the Temporal and Spectral Characteristics of Gamma Ray Bursts written by Jay Preston Norris and published by . This book was released on 1983 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis and Interpretation of Gamma ray Burst Continuum Spectral Evolution with BATSE Data written by Anthony W. Crider and published by . This book was released on 1999 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gamma ray Bursts written by Juri Poutanen and published by . This book was released on 1999 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation Papers from a February 1999 workshop discuss unresolved issues regarding prompt emission of gamma-ray bursts (GRBs). Themes are temporal properties, spectral properties, central engine and radiative mechanisms, spatial distribution, luminosity function, cosmological effects, and future missions. Specific topics include radiation from relativistic strongly magnetized outflows, quasi-thermal comptonization and GRBs, and cosmological signatures in temporal and spectral characteristics of GRBs. The volume lacks a subject index. The editors are affiliated with the Stockholm Observatory. Annotation c. Book News, Inc., Portland, OR (booknews.com)
Download or read book Cosmic Gamma Rays Neutrinos and Related Astrophysics written by M.M. Shapiro and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 686 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Study Institute, Erice, Sicily, Italy, April 20-30, 1988
Download or read book Los Alamos Science written by and published by . This book was released on 1980 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt:
