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Verication and evaluation of the DREAM model for subphotospheric dissipation in prompt GRB emission
KTH, School of Engineering Sciences (SCI).
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Gamma-ray bursts (GRBs) are among the most energetic events in the universe, lasting only seconds and for that brief time outshining all other gamma-ray sources in the universe. However, after decades of studies the emission processes of the prompt  gamma-ray emission phase is still not well understood. A suggested model is the Dissipation with Radiative Emission as A table Model (DREAM). In this thesis a series of systematic tests were performed to test different implementations the DREAM model. The aim was to quantify different kinds of uncertainties in the model, and make suggestions for improvements. 

The models were tested for their dependence in signal-to-noise ratio, how the interpolation of spectra affect the result, and any degeneracies. An optimum signal-to-noise ratio of 40-100 was found. The systematic errors due to using interpolated spectra were found  to be 10-15% in most of the parameter space and to never exceed the estimated uncertainties arising from assumptions made in the physical scenario. In more than ~ 80% of the parameter space, no strong degeneracies were found. The degenerate region is characterized by a small fraction of the dissipated energy going to the electrons. 

Place, publisher, year, edition, pages
, TRITA-FYS, ISSN 0280-316X ; 2016:45
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-191434OAI: diva2:956401
Available from: 2016-08-30 Created: 2016-08-30 Last updated: 2016-08-30Bibliographically approved

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