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Showing 1 to 20 of 49 for “"Gamma Ray Bursts"”.
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Gamma-ray bursts with MeerLICHT
… is the multi-wavelength observational study of gamma-ray burst (GRB) afterglows. The driving force behind this work is the fully robotic MeerLICHT optical telescope which is able to rapidly slew to the position of a GRB in the sky and obtain multi-lter follow-up observations of the early phases …
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Precursors in Gamma-ray Bursts Observed by Fermi
Gamma-ray bursts (GRBs) are some of the most energetic explosions in the universe. They come from the core collapses of massive stars and the mergers of compact objects, and are observed as bright flashes of gamma rays (prompt emission) followed by long-lived, fading emission (afterglow) across the …
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Teilchenbeschleunigung an ultrarelativistischen Stoßfronten und Gamma-Ray Bursts
… untersucht. Stoßfronten dieser Art werden in Gamma-Ray Bursts vermutet, kurzen Ausbrüchen von Gamma-Strahlung, die die leuchtstärksten Objekte im Universum sind und nicht-thermische Spektra aufweisen. Die Teilchenverteilungsfunktion für den Beschleunigungsprozeß wird mit einer …
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Determining the jet opening-angle of gamma-ray bursts
… scientific agreement that at least some cosmic gamma-ray bursts (GRBs) coincide with the deaths of rapidly rotating massive stars - dubbed "hyper-novae." In 1987, a supernova (SN 1987A) was detected in the Large Magellanic Cloud - its progenitor was a blue, rapidly rotating supergiant that was …
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ON THE SPECTRA OF GAMMA-RAY BURSTS AT HIGH ENERGIES
<p>Between 1980 February and 1983 August the Gamma-Ray Spectrometer (GRS) on the Solar Maximum Mission satellite (SMM) observed 71 gamma-ray bursts. These events form a representative subset of the class of classical gamma-ray bursts. Since their discovery more than 15 years ago, hundreds of …
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Testing and improving the luminosity relations for Gamma-Ray Bursts
Gamma Ray Bursts (GRBs) have several luminosity relations where a measurable property of a burst light curve or spectrum is correlated with the burst luminosity. These luminosity relations are calibrated for the fraction of bursts with spectroscopic redshifts and hence the known luminosities. GRBs …
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Determining the jet opening angle of cosmic gamma-ray bursts
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2005.
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An observational study of astrophysical black hole candidatesand gamma ray bursts
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1997.
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The investigation of intrinsic spectral and temporal properties of gamma-ray bursts
Gamma-ray bursts (GRBs) have become a truly unique puzzle in Astronomy. Unlike quasars and pulsars which were explained within years of their discovery, the origins of GRBs remain a mystery more then thirty years after their discovery. Even the most basic information about these events, such as a …
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Faint gamma-ray bursts and other high-energy transients detected with BATSE
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1999.
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HETE, the High Energy Transient Explorer : unlocking the mysteries of gamma ray bursts
… in October 2000 with the goal of studying Gamma Ray Bursts (GRBs) at X-ray and gamma-ray energies. A suite of instruments aboard HETE provide broadband sensitivity to GRBs: the French Gamma Telescope (FREGATE; 6 keV to > 400 keV ) instrument provides sensitive detections at gamma-ray …
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Studies of intrinsic properties of gamma ray bursts detected by the HETE-II satellite
… aim of understanding the intrinsic properties of gamma-ray bursts (GRBs). A technique is developed that allows the simultaneous estimation of source and background counts during a burst with coded aperture instruments such as the Wide-field X-ray Monitor (WXM) on HETE-II. A closely related …
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Observations of X-ray counterparts to gamma-ray bursts in RXTE's All-Sky Monitor
… to rapidly identify and localize new transient X-ray sources observed by the All-Sky Monitor (ASM) on the Rossi X-ray Timing Explorer (XTJS), I used this system to identify fourteen Gamma-Ray Bursts (GRBs). Eight of these events were found in archived ASM observations from the first 1.5 years of …
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A Search for Muon Neutrinos from Gamma-Ray Bursts wih the IceCube 22-String Detector
… searches are conducted for muon neutrinos from Gamma-Ray Bursts (GRBs) using the IceCube detector. Gamma-Ray Bursts are brief and transient emissions of keV/MeV radiation occuring with a rate of a few per day uniformly in the sky. Swift and other satellites of the Third Interplanetary Network …
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Optical observations of afterglows of gamma ray bursts localized by the high energy transient explorer
… Las Campanas Observatory in Chile. Five of the bursts, GRBs 020331, 030115, 030418, 030723, and 030725, had optical afterglows. I was able to make detections of all but GRB 030115. GRBs 011212 and 020531 did not have observed afterglows, and with 030115, I can place constraining upperlimits on …
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Refinements and improvements to a phenomenological model for the jet opening angles of gamma-ray bursts
Long duration gamma-ray bursts (GRBs) are thought to originate from the core collapse of massive, rapidly rotating stars - events called "hypernovae." In this thesis, we improve upon a phenomenological model to determine [theta], the jet opening angle of GRBs. We assume that hypernova progenitors …
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Investigating the properties of gamma ray bursts and gravitational wave standard sirens as high redshift distance indicators
… in literature supporting the viability of Gamma Ray Bursts as cosmological distance indicators, where aside from subjective data-selection, the basic statistical methods are at best questionable and at worst incorrect. To this end, we construct a simple cosmology-independent illustration of …
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All-Sky Search for Very-High-Energy Emission from Primordial Black Holes and Gamma-Ray Bursts with the HAWC Observatory
Transient sources of very-high-energy gamma rays are short-lived astrophysical phenomena often associated with catastrophic events that change their brightness over relatively short timescales. The search for and study of such objects, especially in the TeV energy regime, has the possibility to …
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