High energy polarimetry of prompt GRB emission
نویسندگان
چکیده
منابع مشابه
Prompt GRB emission from gradual energy dissipation
I calculate the emission expected from a Poynting-flux-dominated gamma-ray burst (GRB) flow in which energy is dissipated gradually by magnetic reconnection. In this picture, the energy of the radiating particles is determined by heating and cooling balance (slow heating model). Detailed radiative transfer calculations show that, at Thomson optical depths of order of unity, the dominant radiati...
متن کاملDiagnosing GRB Prompt Emission Site with Spectral Cut-Off Energy
The site and mechanism of gamma-ray burst (GRB) prompt emission is still unknown. Although internal shocks have been widely discussed as the emission site of GRBs, evidence supporting other emission sites, including the closer-in photosphere where the fireball becomes transparent and further-out radii near the fireball deceleration radius where magnetic dissipation may be important, have been a...
متن کاملA : High Energy Observations of the GRB Prompt and Afterglow Emission
Swift discovered GRB 050713A and slewed promptly to begin observing with its narrow field instruments 72.6 seconds after the burst onset, while the prompt gamma-ray emission was still detectable in the BAT. Simultaneous emission from two flares is detected in the BAT and XRT. This burst marks just the second time that the BAT and XRT have simultaneously detected emission from a burst and the fi...
متن کاملSwift measure GRB prompt emission radii ?
The Swift X-Ray Telescope often observes a rapidly decaying X-ray emission stretching to as long as t ∼ 10 3 seconds after a conventional prompt phase. This component is most likely due to a prompt emission viewed at large observer angles θ > 1/Γ, where θ ∼ 0.1 is a typical viewing angle of the jet and Γ ≥ 100 is the Lorentz factor of the flow during the prompt phase. This can be used to estima...
متن کاملThe Theory of Spectral Evolution of the Grb Prompt Emission
We develop the theory of jitter radiation from GRB shocks containing small-scale magnetic fields and propagating at an angle with respect to the line of sight. We demonstrate that the spectra vary considerably: the low-energy photon index, α, ranges from 0 to −1 as the apparent viewing angle goes from 0 to π/2. Thus, we interpret the hard-to-soft evolution and the correlation of α with the phot...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: New Astronomy Reviews
سال: 2017
ISSN: 1387-6473
DOI: 10.1016/j.newar.2016.11.001