Structured GRB jet simulations find that local electron cooling shifts the synchrotron cooling break up by over a factor of ten, smooths the transition, produces steeper post-break slopes initially, and originates from a narrow frequency-dependent region behind the shock front.
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Simulations show hierarchical subsolar-mass mergers in collapsar disks can retain eccentricity up to e~0.1 at merger as a potential observational signature.
Simulations of VLBI networks including SKA-Mid in AA* and AA4 configurations predict 2x better size constraints, 4-30x improved Declination localization, and 3x better off-axis proper-motion detection for GRBs, extending measurable events to z approximately 0.25.
A structured jet model with weak-scattering thermal heating in the mixed cocoon region reproduces the quasi-thermal and non-thermal spectra of GRB 090902B while broader spectra appear in strong-scattering cases.
Simulations of the BSD instrument for POLAR-2 show it can localize faint GRBs like GRB 170817A to about 1.5 degrees accuracy, meeting requirements for supporting GRB polarimetry.
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Moving-mesh simulations of spreading dynamics and local electron cooling in structured gamma-ray burst afterglow jets
Structured GRB jet simulations find that local electron cooling shifts the synchrotron cooling break up by over a factor of ten, smooths the transition, produces steeper post-break slopes initially, and originates from a narrow frequency-dependent region behind the shock front.
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Eccentricity as a signature of hierarchical subsolar-mass mergers in collapsar disks
Simulations show hierarchical subsolar-mass mergers in collapsar disks can retain eccentricity up to e~0.1 at merger as a potential observational signature.
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Gamma-ray Bursts in the Radio Sky: the Role of the SKA-VLBI
Simulations of VLBI networks including SKA-Mid in AA* and AA4 configurations predict 2x better size constraints, 4-30x improved Declination localization, and 3x better off-axis proper-motion detection for GRBs, extending measurable events to z approximately 0.25.
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Shear Particle Acceleration in Structured Gamma-Ray Burst Jets: IV. Thermal {\em vs.} Non-thermal Emission of the Jet Cocoon
A structured jet model with weak-scattering thermal heating in the mixed cocoon region reproduces the quasi-thermal and non-thermal spectra of GRB 090902B while broader spectra appear in strong-scattering cases.