Search for dissertations about: "GRB"

Showing result 1 - 5 of 17 swedish dissertations containing the word GRB.

2. 1. Neutrino emission from high-energy component gamma-ray bursts

   Author : Martino Olivo; Allan Hallgren; Olga Botner; Nils Bergvall; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; neutrino; GRB; IceCube; Astroparticle physics; Astropartikelfysik;

   Abstract : Gamma-ray bursts (GRBs) are brief and sudden explosions radiating most of their energy in the soft γ-ray band ( 100 keV). In the context of multimessenger astroparticle physics recent observations of GRBs provide an excellent benchmark for testing theoretical models of high energy emission mechanisms. READ MORE

4. 2. Multi-messenger emission from gamma-ray bursts

   Author : Filip Samuelsson; Felix Ryde; Peter Mészáros; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; astrophysics; gamma-ray bursts; cosmic rays; Atomic; Subatomic and Astrophysics; Atomär fysik; subatomär fysik och astrofysik;

   Abstract : Multi-messenger astronomy is a very hot topic in the astrophysical community. A messenger is something that carries information. Different astrophysical messenger types are photons, cosmic rays, neutrinos, and gravitational waves. They all carry unique and complementary information to one another. READ MORE

5. 3. Photospheric emission from structured, relativistic jets : applications to gamma-ray burst spectra and polarization

   Author : Christoffer Lundman; Felix Ryde; Andrei Beloborodov; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; gamma-ray bursts; photospheric emission; radiative processes; polarization; special relativity;

   Abstract : The radiative mechanism responsible for the prompt gamma-ray burst (GRB) emission remains elusive. For the last decade, optically thin synchrotron emission from shocks internal to the GRB jet appeared to be the most plausible explanation. READ MORE

6. 4. Search for neutrinos from precursors and afterglows of Gamma-ray Bursts using the IceCube Neutrino Observatory

   Author : Kunal Deoskar; Chad Finley; Klas Hultqvist; Magnus Axelsson; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Astroparticle physics; neutrinos; acceleration of particles; Gamma ray bursts; Physics; fysik;

   Abstract : Gamma ray bursts (GRBs) have long been considered as a possible source of ultra high energy cosmic rays, which makes them a promising neutrino source candidate. Previous IceCube searches for neutrino correlations with GRBs focused on the prompt phase of the GRB and found no significant correlation between neutrino events and the observed GRBs. READ MORE

7. 5. Photospheric emission in gamma-ray bursts

   Author : Christoffer Lundman; Felix Ryde; Stephan Rosswog; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES;

   Abstract : This thesis considers emission from gamma-ray bursts (GRBs), the most powerful explosions known in the Universe. Most GRBs are likely associated with the final stages of stellar evolution, where the core of a massive star collapses, and gives birth to a highly compact object such as a neutron star or black hole. READ MORE