Dissertations / Theses on the topic 'Gamma Ray Bursts (GRBs)'
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Nakauchi, Daisuke. "Gamma-Ray Bursts from First Stars and Ultra-Long Gamma-Ray Bursts." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/199100.
Full textChapman, Robert. "Gamma-ray bursts in the local universe." Thesis, University of Hertfordshire, 2009. http://hdl.handle.net/2299/2809.
Full textGalante, Douglas. "Efeitos astrofísicos e astrobiológicos de Gamma-Ray Bursts." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/14/14131/tde-19062009-014454/.
Full textThe present work has the main goal of understanding the possible effects of the hard gamma radiation produced during a Gamma-Ray Burst (GRB) event both on the interstellar medium surrounding the source of the burst and on planets possibly illuminated. Gamma-Ray Bursts were first detected on the 60s and quickly have attracted the attention of the astrophysical community, since the energies emitted just in could reach 1054erg, the rest mass of the Sun. No mechanism was known to be so efficient in extracting gravitational energy to produce such emission. Later on, the possibility of the emission being collimated has lowered the energy of the to 5x1051erg, but the central engine has not yet been completely understood, and there is still ample room for exotic alternatives. We have studied the effects of GRB on the ISM, in an attempt to distinguish the candidates of GRB remnants from those generated by multiple supernovae. We have used both energetic arguments and the possibility of chemical alterations due to photonuclear reactions. We have also worked on the biological implications of the illumination of planets by a GRB, concluding that the effects of such event could seriously harm the biosphere of a planet even at distances of ~10kpc.
Olivo, Martino. "Neutrino emission from high-energy component gamma-ray bursts." Licentiate thesis, Uppsala universitet, Högenergifysik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-132961.
Full textCasey, James David. "Search for high energy GRB neutrinos in IceCube." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53839.
Full textHarstad, Emelie. "A Targeted LIGO-Virgo Search for Gravitational Waves Associated with Gamma-Ray Bursts Using Low-Threshold Swift GRB Triggers." Thesis, University of Oregon, 2013. http://hdl.handle.net/1794/13003.
Full textSears, Huei M. "Investigation of the Mass-Metallicity Relation of GRB Host Galaxies at z ~ 4.7." Ohio University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1597762492071921.
Full textKuehn, Frederick Gabriel. "Finding Gamma Ray Bursts at High Energies and Testing the Constancy of the Speed of Light." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1214582047.
Full textBardho, Onelda. "Comprendre la physique des sursauts gamma grâce aux corrélations dans les données." Thesis, Nice, 2016. http://www.theses.fr/2016NICE4004/document.
Full textGRBs are ashes of gamma-rays coming from cosmos. They are one of the most mysteriousevents we have been able to observe since their discovery. GRBs are classified into two groups: long/soft GRBs and short/hard GRBs. Their emission mechanism consists of two phases: prompt emission and afterglow emission. The launch of the Swift satellite opened a New Era in the GRBs research. Swift is able to provide accurate position for more GRBs than previous missions, thanks to its fast capabilities of slewing. Furthermore, the Swift shows that GRBs have a canonical behaviour for the X-ray afterglow light curves. The data analysis process remains the key point of GRBs studies. I present a detailed study of the peculiar GRB 141221A at different wavelengths. GRB 141221A shows an unusual steep rise in the optical light curve of the afterglow. The broad band spectral energy distribution, taken near the maximum of the optical emission, presents either a thermal component or a behaviourbreak. This burst displays unusual feature in the optical band, whereas the X-ray data is more common. GRB 141221A is one of the challenging bursts that excludes a stellar wind from the progenitor of the GRBs. A clustering in the X-ray afterglow light curves was observed before the launch of the Swift satellite. This feature has been debated after the launch of the Swift. We have built a sample which consists of 254 GRBs that shows a scattering of the data for the flux distribution at one day. This distribution was investigated with a normalization of light curves at redshift one. We have investigated the problem into three different directions
Laskar, Tanmoy, Kate D. Alexander, Edo Berger, Wen-fai Fong, Raffaella Margutti, Isaac Shivvers, Peter K. G. Williams, et al. "A REVERSE SHOCK IN GRB 160509A." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/624020.
Full textDrenkhahn, Georg. "Magnetically powered gamma-ray bursts." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2002. http://dare.uva.nl/document/91783.
Full textRau, Arne. "Gamma-ray bursts a population study /." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=978976266.
Full textLundman, Christoffer. "Photospheric emission in gamma-ray bursts." Licentiate thesis, KTH, Partikel- och astropartikelfysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-101913.
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Williamson, Andrew Robert. "Gravitational waves with gamma-ray bursts." Thesis, Cardiff University, 2016. http://orca.cf.ac.uk/96479/.
Full textRamirez-Ruiz, Jorge Enrico. "A theory of gamma-ray bursts." Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619958.
Full textLevan, Andrew J. "Gamma-ray bursts and their environments." Thesis, University of Leicester, 2005. http://hdl.handle.net/2381/30687.
Full textYamazaki, Ryo. "Toward the Unified Theory of Long and Short Gamma-Ray Bursts, X-Ray Rich Gamma-Ray Bursts, and X-Ray Flashes." 京都大学 (Kyoto University), 2004. http://hdl.handle.net/2433/147812.
Full textAlexander, K. D., T. Laskar, E. Berger, C. Guidorzi, S. Dichiara, W. Fong, A. Gomboc, et al. "A Reverse Shock and Unusual Radio Properties in GRB 160625B." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/626042.
Full textPredoi, Valeriu. "Gravitational waves and short gamma ray bursts." Thesis, Cardiff University, 2012. http://orca.cf.ac.uk/39987/.
Full textSamuelsson, Filip. "Multi-messenger emission from gamma-ray bursts." Licentiate thesis, KTH, Partikel- och astropartikelfysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-273383.
Full text”Multi-messenger astronomy” (mångbudbärarastronomi, fri översättning) är ett väldigt aktuellt område inom astrofysiken just nu. En meddelare är någonting som bär på information. Olika meddelartyper inom astrofysiken är fotoner, kosmisk strålning, neutriner och gravitations vågor. Dessa har alla unik och olika typ av information som kompletterar varandra. Idén bakom multi-meddelare-astronomi är att ju fler olika meddelartyper vi kan upptäcka från samma event, desto mer komplett blir vår fysikaliska tolkning. I denna avhandling studerar jag multi-meddelare emission från gammablixtar (GRBs), de mest ljusstarka företeelser vi känner till i Universum. Mer specifikt, så studerar jag kopplingen mellan GRBs och ultraenergetisk kosmisk strålning (UHECRs). Ursprunget till UHECRs är fortfarande okänt trots långt pågående forskning. GRBs har länge varit en av de mest lovande accelerationskandidaterna men än så länge finns inga fasta bevis. I Paper I och Paper II studerar vi den möjliga GRB-UHECR kopplingen genom att studera den elektromagnetiska strålningen från elektronerna som även de skulle bli accelererade tillsammans med UHECRs. Min slutsats är att strålningen från elektronerna inte matchar observationer från GRBs, vilket talar emot att en majoritet av UHECRs kommer från GRBs.
Ukwatta, T. N., K. Hurley, J. H. MacGibbon, D. S. Svinkin, R. L. Aptekar, S. V. Golenetskii, D. D. Frederiks, et al. "INVESTIGATION OF PRIMORDIAL BLACK HOLE BURSTS USING INTERPLANETARY NETWORK GAMMA-RAY BURSTS." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/621378.
Full textGuthmann, Axel W. "Teilchenbeschleunigung an ultrarelativistischen Stossfronten und Gamma-Ray-Bursts." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=967133750.
Full textBorgonovo, Luis. "Spectral and Temporal Studies of Gamma-Ray Bursts." Doctoral thesis, Stockholm : Department of Astronomy, Stockholm University, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-6793.
Full textSchady, Patricia. "Prompt observations of Gamma-Ray Bursts with Swift." Thesis, University College London (University of London), 2008. http://discovery.ucl.ac.uk/1445047/.
Full textZhu, Sylvia Jiechen. "Precursors in gamma-ray bursts observed by Fermi." Thesis, University of Maryland, College Park, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10011526.
Full textGamma-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 electromagnetic spectrum. The instruments on the Fermi Gamma-ray Space Telescope provide excellent observations of GRBs across a large energy range. The Gamma-ray Burst Monitor (GBM, 8 keV to 40 MeV) is currently the most prolific detector of GRBs, and the Large Area Telescope (LAT, ∼20 MeV to >300 GeV) has opened up the field of GRB observations to high-energy gamma rays.
In this thesis, I present studies on improving the LAT’s capability to detect GRBs onboard in realtime, and analyses of both a single, extraordinary burst (the record-breaking GRB 130427A) and the population of GBM GRBs with precursors in their lightcurves. In a small fraction of GRBs, a dim peak appears before the much brighter peaks that are normally observed during the prompt emission. I explore whether the properties of GRBs with precursors suggests that precursors have a distinct physical origin from the rest of the prompt emission, and discuss the implications for models of GRB precursor emission.
Tunnicliffe, Rachel L. "Constraining the progenitors of short gamma-ray bursts." Thesis, University of Warwick, 2014. http://wrap.warwick.ac.uk/60503/.
Full textGompertz, Benjamin Paul. "The progenitors of extended emission gamma-ray bursts." Thesis, University of Leicester, 2015. http://hdl.handle.net/2381/32517.
Full textLaskar, Tanmoy. "The Diversity and Versatility of Gamma-Ray Bursts." Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:17467212.
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Panaitescu, Alin-Daniel. "Gamma-ray bursts and afterglows from relativistic fireballs." Adobe Acrobat reader required to view the full dissertation, 1999. http://www.etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-11/index.html.
Full textAhlgren, Björn. "Subphotospheric dissipation in gamma-ray bursts observed by the Fermi Gamma-ray Space Telescope." Licentiate thesis, KTH, Partikel- och astropartikelfysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-202323.
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Fong, W., R. Margutti, R. Chornock, E. Berger, B. J. Shappee, A. J. Levan, N. R. Tanvir, et al. "THE AFTERGLOW AND EARLY-TYPE HOST GALAXY OF THE SHORT GRB 150101B AT z = 0.1343." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/622673.
Full textIoka, Kunihito. "Relativistic jets from magnetars towards understanding Gamma-Ray Bursts." 京都大学 (Kyoto University), 2001. http://hdl.handle.net/2433/150815.
Full textHurkett, Cheryl Pauline. "Gamma ray bursts : selected results from the Swift mission." Thesis, University of Leicester, 2009. http://hdl.handle.net/2381/4380.
Full textFong, Wen-fai. "Unveiling the Progenitors of Short-duration Gamma-ray Bursts." Thesis, Harvard University, 2014. http://dissertations.umi.com/gsas.harvard:11665.
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McEvoy, Erica Lynn 1981. "Determining the jet opening-angle of gamma-ray bursts." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/32718.
Full textIncludes bibliographical references (leaves 25-28).
There is growing 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 probably a member of a binary system that underwent merger prior to the supernova event [1]. Was SN 1987A a (possibly failed) hypernova? Although no accompanying GRB was detected, there is evidence [2] that one may have occurred but was beamed in a direction away from the earth. If so, are massive binary systems the progenitors of hypernovae and, in turn, of GRBs? In this thesis, we use a phenomenological model to determine [theta], the opening angle of the beams of GRBs. Our basic underlying assumption is that objects like SN 1987A are hypernovae, i.e., that they produce certain GRBs. We calculate [theta] by deriving two expressions for the probability that a given GRB is detected, one based on the solid geometry implied by the beaming model and the other based on the number of GRBs observed over time. These expressions give the probability as a function of a few key physical variables. By obtaining realistic estimates of the physical variables, equating the two expressions, and performing a Monte-Carlo simulation, we obtain an estimate of the most probable value of [theta]. We find that [theta] = 6.203⁰ ± 1.620⁰. Because this result is well in agreement with values inferred from the observed properties of GRBs [3]; and with values calculated based on the structured jet model of GRBs [4], we conclude that our underlying assumption - that SN 1987A was a hypernova - is at the very least plausible.
by Erica Lynn McEvoy.
S.B.
Cenko, Stephen Bradley Harrison Fiona A. Harrison Fiona A. Kulkarni S. R. "The energetics and environments of Swift gamma-ray bursts /." Diss., Pasadena, Calif. : California Institute of Technology, 2009. http://resolver.caltech.edu/CaltechETD:etd-06272008-153145.
Full textAoi, Junichi. "Exploring the Gamma Ray Bursts from GeV-TeV spectra." 京都大学 (Kyoto University), 2011. http://hdl.handle.net/2433/142363.
Full textValan, Vlasta. "Thermal components in the early X-ray afterglow of gamma-ray bursts." Licentiate thesis, KTH, Partikel- och astropartikelfysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-217103.
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Deprez, Hannah. "Investigating the Time Evolution of X-Ray Absorption in Gamma-Ray Bursts." Thesis, KTH, Fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-277830.
Full textWillis, Dave. "Mass modelling techniques for gamma ray burst missions." Thesis, University of Southampton, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274467.
Full textIyyani, Shabnam. "Photospheric emission in gamma ray bursts : Analysis and interpretation of observations made by the Fermi gamma ray space telescope." Doctoral thesis, Stockholms universitet, Fysikum, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-116244.
Full textAt the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 4: In press. Paper 5: Submitted.
Tam, Pak-hin. "A study of the optical afterglows of gamma-ray bursts." Thesis, Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B31367677.
Full textNaumann-Godó, Melitta. "Sensitivity of the ANTARES neutrino telescope to gamma-ray bursts." [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=983803072.
Full textCampisi, Maria Angela. "Gamma-ray Bursts and their Host Galaxies from Cosmological Simulation." Diss., lmu, 2009. http://nbn-resolving.de/urn:nbn:de:bvb:19-110091.
Full textTaylor, Paul A. "Understanding long-duration gamma-ray bursts : modelling collapsars with SPH." Thesis, University of Oxford, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.497107.
Full textMcEvoy, Erica Lynn 1981. "Determining the jet opening angle of cosmic gamma-ray bursts." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33943.
Full textLittlejohns, Owen Madoc. "Modelling the prompt and afterglow emission of gamma-ray bursts." Thesis, University of Leicester, 2013. http://hdl.handle.net/2381/27949.
Full textJonsson, Teodor, and Oscar Wistemar. "Exploring Absorption in the Host Galaxies of Gamma-Ray Bursts." Thesis, KTH, Skolan för teknikvetenskap (SCI), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-276423.
Full textGammablixtar är extremt högenergetiska pulser som är sammankopplade med supernovor och formeringen av svarta hål. De är indelade i två typer, långa och korta gammablixtar. Utstrålningen från gammablixtar är uppdelade i två olika faser, prompt emission som huvudsakligen observeras i gammastrålning och efterglöden som är då den relativistiska jetstrålen kolliderar med det omkringliggande materialet. Det kan observeras att röntgenstrålningen absorberas, däremot kan vi inte säga hur denna absorption är fördelad mellan det intergalaktiska mediet(IGM) och värdgalaxen. Den här rapporten kommer använda spektralanalys av av gammablixtar vid olika rödskifte genom att använda röntgen data från Swift teleskopet för att undersöka tidsevolutionen av absorptionen. Konstant evolution tyder på att majoriteten av absorptionen sker i IGM medans för avtagande nära gammablixten. Spektrum kommer anpassas till en absorberad power-law med användande av chi-kvadrat statistiska metoder. Resultatet kommer att uppvisa ett tydligt fall med konstant beteende och två som verkar konstanta men med dålig statistik. En gammablixt visar tydligt avtagande beteende. Två stycken uppvisar icke-fysikaliskt beteende vilket kan vara en indikation på att den absorberade potenslagen vi använder ej är den korrekta modellen. Givet osäkerheten i analysen så kan vi dra slutsatsen att majoriteten av gamma-blixtarna vi analyserat uppvisar konstant beteende vilket indikerar att absorptionen är dominant inom det intergalaktiska mediet.
Bloom, Joshua Simon Harrison Fiona A. "Towards an understanding of the progenitors of gamma-ray bursts /." Diss., Pasadena, Calif. : California Institute of Technology, 2002. http://resolver.caltech.edu/CaltechETD:etd-01062003-061357.
Full text林敬偉 and King-wai Lam. "Time delay and broadening of gamma ray bursts in various energy bands." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1995. http://hub.hku.hk/bib/B31213200.
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