Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 33 for “"GRB"”.
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HETE, the High Energy Transient Explorer : unlocking the mysteries of gamma ray bursts
… 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 energies, the Wide-Field …
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Gamma-ray bursts with MeerLICHT
… 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 of the afterglow, …
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Observations of X-ray counterparts to gamma-ray bursts in RXTE's All-Sky Monitor
… 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 operation, but the rest were detected and reported within 2 - 32 hours of the event. In thirteen of the fourteen cases, I was able to provide error …
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The very high energy gamma ray burst GRB190114C as observed by MeerKAT
… study of the highly energetic gamma ray burst (GRB), GRB190114C, which was the first GRB to have been recorded at teraelectronvolt (TeV) energies by the MAGIC telescope. We have observed this GRB with MeerKAT from as early as within the first day of the burst event, up to nearly a year at over …
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The first 2.5 years of the HETE : toward an understanding of the nature of short and long duration gamma-ray bursts
… prior to July 1 of 2003, 42 Gamma-ray bursts (GRBs) were promptly localized and publicized over the GRB Coordinates Network (GCN). The first part of this thesis deals with the detection of GRBs in data down-linked from the HETE satellite using a suite of automated routines. This "ground …
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Investigation of the role of HSP70 in the uptake of Granzyme B by Malaria parasite-infected erythrocytes
… is thought to recruit NK cells and Granzyme B (GrB) via its 14 amino acid sequence, TKDNNLLGRFELSG, known as the TKD motif. Both PfHsp70-x and human Hsp70 (hHsp70) contain the TKD motif. Thus, this study sought to investigate the role of Hsp70 in facilitating the selective targeting of malaria …
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Role of heat shock protein 70 and sulphatases 1 and 2 in apoptosis induced by cytotoxic cells of the immune system
… mitochondrialem Cytochrom-C-Gehalt nach GrB-induzierter Apoptose signifikant. Diese Ergebnisse deuten darauf hin, dass HSP70 die GrB-induzierte Apoptose nicht inhibiert sondern stattdessen das Voranschreiten der Apoptose leicht beschleunigen kann. Im Gegensatz dazu stehen die Ergebnisse …
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Challenges and successes of gender focal point persons in the context of gender responsive budgeting initiatives in Namibia
… to comply with the Gender Responsive Budgeting (GRB) initiative, in 2014. The implementation of the GRB initiative requires all OMAs to have Gender Focal Point Persons (GFPPs) in all government institutions, specifically responsible for ensuring that gender issues are mainstreamed in all relevant …
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High cadence optical polarimetry for time domain astronomy on the Liverpool Telescope
… to triggers of new gamma-ray burst (GRB) events, starting within 2-3 minutes of the detection of the prompt emission. The observed radiation from GRBs is released from relativistic jets. Launched from a black hole central engine, the energy within the jets is converted to the observed …
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Dual Constraint Problem Optimization Using A Natural Approach: Genetic Algorithm and Simulated Annealing
… is tasked to the Grid Resource Broker (GRB). The GRB must use an optimization algorithm that returns an accurate result in a timely mam1er. The Genetic Algorithm and the Simulated Annealing algorithm can both be used to achieve this goal, although Simulated Annealing outperforms the …
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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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A Test of the Cosmological Principle with Reported Superlarge Structures
… and a review of quasars and Gamma-ray Bursts (GRBs). The statistical methods and measurements used in this research will be explained in detail. The resulting statistics are explored for a Gamma-ray burst data set, two quasar data sets with positive and negative galactic latitude, and a data …
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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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Relativistic Jets from Compact Binary Mergers as Electromagnetic Counterparts to Gravitational Wave Sources
… dominant progenitor of short gamma-ray bursts (GRBs). Here we investigate the possibility that there is a hidden population of low-Lorentz factor jets resulting in failed GRBs, on-axis orphan afterglows, and what kind of counterparts can be expected given a merger-jet population dominated by …
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All-Sky Search for Neutrinos Correlated with Gamma-Ray Bursts in Extended Time Windows Using Eight Years of IceCube Data
GRBs have long been considered as potential sources of hadronic acceleration of ultra-high energy cosmic rays and, more recently, as potential sources of the diffuse neutrino flux measured by IceCube. This thesis presents a search for neutrinos correlated with 2,091 gamma-ray bursts (GRBs) in …
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Observational Investigations of the Progenitors of Supernovae
… into discovering the progenitor systems. The GRB-SN 120422A/2012bz is investigated and found to be an extremely luminous and energetic SN, even amongst the infamously bright GRB-SNe. A method is presented that allows an accurate reconstruction of the bolometric light curve of a core-collapse …
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Determining the jet opening-angle of gamma-ray bursts
… 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 probably a member …
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Investigating Interstellar dust in the Milky Way through X-ray scattering and absorption
… X-ray dust-scattering rings generated by GRB 221009A, the brightest gamma-ray burst ever recorded. Using observations from XMM-Newton and The Neil Gehrels Swift Observatory, we mapped the ISM along the burst direction with higher resolution than existing optical and infrared …
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