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GRB 080913 at redshift 6.7
J. Greiner, T. Kruehler, J. P. U. Fynbo +44
We report on the detection by Swift of GRB 080913, and subsequent optical/near-infrared follow-up observations by GROND which led to the discovery of its optical/NIR afterglow and…
High Energy Neutrinos and Photons from Curvature Pions in Magnetars
T. Herpay, S. Razzaque, A. Patkos +1
We discuss the relevance of the curvature radiation of pions in strongly magnetized pulsars or magnetars, and their implications for the production of TeV energy neutrinos detectab…
GLAST Prospects for Swift-Era Afterglows
L. J. Gou, P. Meszaros
We calculate the GeV spectra of GRB afterglows produced by inverse Compton scattering of the sub-MeV emission of these objects. We improve on earlier treatments by using refined af…
Gamma-Ray Bursts
P. Meszaros
Gamma-ray bursts are the most luminous explosions in the Universe, and their origin and mechanism are the focus of intense research and debate. More than three decades after their…
Theoretical Aspects of High Energy Neutrinos and GRB
P. Meszaros, S. Razzaque
Neutrinos at energies ranging from sub-TeV to EeV from astrophysical sources can yield interesting physical information about fundamental interactions, about cosmic rays and about…
Late-Time X-ray Flares during GRB Afterglows: Extended Internal Engine Activity
A. D. Falcone, D. N. Burrows, P. Romano +21
Observations of gamma ray bursts (GRBs) with Swift produced the initially surprising result that many bursts have large X-ray flares superimposed on the underlying afterglow. These…
Optical afterglows of short Gamma-ray Bursts and GRB 040924
Y. Z. Fan, Bing Zhang, Shiho Kobayashi +1
Short-duration Gamma-ray bursts (GRBs) (\leq 2{\rm s}) have remained a mystery due to the lack of afterglow detection until recently. The models to interpret short GRBs invoke dist…
Gravitational Wave and X-ray Signals from Stellar Disruption by a Massive Black Hole
Shiho Kobayashi, Pablo Laguna, E. Sterl Phinney +1
Gravitational waves and X-ray flares are expected from tidal disruption of stars by a massive black hole. Using a relativistic smoothed particle hydrodynamics code, we investigate…
X-ray Rich GRB, Photospheres and Variability
P. Meszaros, E. Ramirez-Ruiz, M. J. Rees +1
We investigate the relationship between the quasi-thermal baryon-related photosphere in relativistic outflows, and the internal shocks arising outside them, which out to a limiting…
Collapsar Uncorking and Jet Eruption in GRB
E. Waxman, P. Meszaros
We show that the collapsar model of gamma-ray bursts results in a series of successive shocks and rarefaction waves propagating in the "cork" of stellar material being pushed ahead…
The X-ray afterglow of GRB000926 observed by BeppoSAX and Chandra: a mildly collimated fireball in a dense medium ?
L. Piro, G. Garmire, M. R. Garcia +8
We present X-ray observations of the afterglow of GRB000926 performed around and after the break observed in the optical light curve two days after the burst. The steep X-ray light…
Gamma-Ray Bursts: Afterglow Implications, Progenitor Clues and Prospects
P. Meszaros
Gamma-ray bursts (GRB) are sudden, intense flashes of gamma-rays which, for a few blinding seconds, light up in an otherwise fairly dark gamma-ray sky. They are detected at the rat…
Iron K-alpha Emission from a Decaying Magnetar Model of Gamma-Ray Bursts
M. J. Rees, P. Meszaros
The recent report of X-ray Fe features in the afterglow of the gamma-ray burst GRB 991216 may provide important clues for identifying the nature of its progenitor and constraining…
Multi-GeV Neutrinos from Internal Dissipation in GRB Fireballs
P. Meszaros, M. J. Rees
Sub-photospheric internal shocks and transverse differences of the bulk Lorentz factor in relativistic fireball models of GRB lead to neutron diffusion relative to protons, resulti…
Origin of Gamma Ray Bursters
P. Meszaros
The successful discovery of X-ray, optical and radio afterglows of GRB has made possible the identification of host galaxies at cosmological distances. The energy release inferred…
The Fireball Shock Model of Gamma Ray Bursts
P. Meszaros
Gamma-ray bursts are thought to be the outcome of a cataclysmic event leading to a relativistically expanding fireball, in which particles are accelerated at shocks and produce non…
Early X-ray/UV Line Signatures of GRB Progenitors and Hypernovae
C. Weth, P. Meszaros, T. Kallman +1
We calculate the X-ray/UV spectral line signatures expected from the interaction of a gamma-ray burst afterglow and a dense pre-burst environment produced by the progenitor. We exp…
Steep Slopes and Preferred Breaks in GRB Spectra: the Role of Photospheres and Comptonization
P. Meszaros, M. J. Rees
The role of a photospheric component and of pair breakdown is examined in the internal shock model of gamma-ray bursts. We discuss some of the mechanisms by which they would produc…
GRB 990123: Reverse and Internal Shock Flashes and Late Afterglow
P. Meszaros, M. J. Rees
The prompt $(t \siml 0.16$ days) light curve and initial 9-th magnitude optical flash from GRB 990123 can be attributed to a reverse external shock, or possibly to internal shocks.…
Spectral Features from Ultrarelativistic Ions in Gamma-Ray Bursts?
P. Meszaros, M. J. Rees
Gamma ray burst outflows may entrain small blobs or filaments of dense, highly ionized metal rich material. Such inhomogeneities, accelerated by the flow to Lorentz factors in the…
Refreshed Shocks and Afterglow Longevity in GRB
M. J. Rees, P. Meszaros
We consider fireball models where the ejecta have a range of bulk Lorentz factors, so that the inner (lower ) parts may carry most of the mass, or even most of the energy. The o…
Theoretical Models of Gamma-Ray Bursts
P. Meszaros
Models of gamma ray bursts are reviewed in the light of recent observations of afterglows which point towards a cosmological origin. The physics of fireball shock models is discuss…
Radiative Regimes in Gamma-Ray Bursts and Afterglows
A. Panaitescu, P. Meszaros
We present numerical simulations of Gamma-Ray Bursts arising from external shocks in the impulsive and wind models, including a weak or a strong coupling between electrons and prot…
Rings in Fireball Afterglows
A. Panaitescu, P. Meszaros
We derive the equation for the surface of equal arrival times of radiation from a thin relativistic shell interacting with an external medium, representing the afterglow of a gamma…