An ANN emulator of a kinetic SSC afterglow code enables MCMC inference on GRB 190114C, yielding E_k,iso ~ 7.2e54 erg, Gamma ~ 575, n ~ 0.1 cm^-3, while flagging that the constant-density ISM fails at late times.
GRB110721A: An extreme peak energy and signatures of the photosphere
3 Pith papers cite this work. Polarity classification is still indexing.
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Pith papers citing it
abstract
GRB110721A was observed by the Fermi Gamma-ray Space Telescope using its two instruments the Large Area Telescope (LAT) and the Gamma-ray Burst Monitor (GBM). The burst consisted of one major emission episode which lasted for ~24.5 seconds (in the GBM) and had a peak flux of 5.7\pm0.2 x 10^{-5} erg/s/cm^2. The time-resolved emission spectrum is best modeled with a combination of a Band function and a blackbody spectrum. The peak energy of the Band component was initially 15\pm2 MeV, which is the highest value ever detected in a GRB. This measurement was made possible by combining GBM/BGO data with LAT Low Energy Events to achieve continuous 10--100 MeV coverage. The peak energy later decreased as a power law in time with an index of -1.89\pm0.10. The temperature of the blackbody component also decreased, starting from ~80 keV, and the decay showed a significant break after ~2 seconds. The spectrum provides strong constraints on the standard synchrotron model, indicating that alternative mechanisms may give rise to the emission at these energies.
fields
astro-ph.HE 3years
2026 3representative citing papers
An analytical model for multiwavelength synchrotron emission from decelerated quasi-spherical ejecta with energy injection in stratified environments is developed for the deep Newtonian regime of GRB afterglows.
A review of early optical GRB features including prompt emission, reverse shocks, and afterglow onset, highlighting robotic telescopes' role in constraining jet Lorentz factors and magnetization.
citing papers explorer
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Very High-Energy GRB Afterglow Fits with Neural-Network Emulation and Bayesian inference
An ANN emulator of a kinetic SSC afterglow code enables MCMC inference on GRB 190114C, yielding E_k,iso ~ 7.2e54 erg, Gamma ~ 575, n ~ 0.1 cm^-3, while flagging that the constant-density ISM fails at late times.
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Deep Newtonian Afterglows: Theoretical Light Curves for Quasi-spherical Outflows
An analytical model for multiwavelength synchrotron emission from decelerated quasi-spherical ejecta with energy injection in stratified environments is developed for the deep Newtonian regime of GRB afterglows.
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Early Optical Follow-up of Gamma-Ray Bursts: The Critical Role of Robotic Telescopes
A review of early optical GRB features including prompt emission, reverse shocks, and afterglow onset, highlighting robotic telescopes' role in constraining jet Lorentz factors and magnetization.