Back to Search
Start Over
Parameter Inference of a State-of-the-Art Physical Afterglow Model for GRB 190114C.
- Source :
- Galaxies (2075-4434); Feb2024, Vol. 12 Issue 1, p5, 16p
- Publication Year :
- 2024
-
Abstract
- A state-of-the-art semi-analytic gamma-ray burst (GRB) afterglow model with synchrotron self-Compton (SSC) emission has been applied for the first time for parameter inference using real GRB data. We analyzed the famous GRB 190114C as a case study. GRB 190114C, characterized by its long duration and high luminosity, was observed by many ground-based and orbiting telescopes spanning a wide range of electromagnetic wavelengths, from radio to GeV gamma rays. We used two advanced algorithms for inference: a nested sampling algorithm called UltraNest and an MCMC algorithm emcee. Evoking the standard afterglow model, the inference result and the best-fit values lead to an initial bulk Lorentz factor (a rough estimate of Γ = 526 ), which aligns with the values often seen in GRBs identified by the Fermi-LAT instrument. Similarly to the best-fit values of other studies in the literature, the derived values of microphysical parameters, the circumburst density, and the kinetic efficiency are consistent with those found after modeling the multi-wavelength observations in GRB 190114C. We show that the SSC from the forward-shock region can only describe the highest-energy photons above a few GeVs. [ABSTRACT FROM AUTHOR]
- Subjects :
- GAMMA ray bursts
GAMMA rays
ORBITS (Astronomy)
MARKOV chain Monte Carlo
Subjects
Details
- Language :
- English
- ISSN :
- 20754434
- Volume :
- 12
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Galaxies (2075-4434)
- Publication Type :
- Academic Journal
- Accession number :
- 175646294
- Full Text :
- https://doi.org/10.3390/galaxies12010005