Exceptionally bright optical emission from a rare and distant $\gamma-$ray burst
Abstract
Long -ray bursts (GRBs) are produced by the dissipation of ultra-relativistic jets launched by newly-born black holes after the collapse of massive stars. Right after the luminous and highly variable -ray emission, the multi-wavelength afterglow is released by the external dissipation of the jet in circumburst medium. We report the discovery of a very bright ( mag) optical emission s after the explosion of the extremely luminous and energetic GRB 210619B located at redshift 1.937. Early multi-filter observations allowed us to witness the end of the shock wave propagation into the GRB ejecta. We observed the spectral transition from a bright reverse to the forward shock emission, demonstrating that the early and late GRB multi-wavelength emission is originated from a very narrow jet propagating into an unusually rarefied interstellar medium. We also find evidence of an additional component of radiation, coming from the jet wings which is able explain the uncorrelated optical/X-ray emission.
Keywords
Cite
@article{arxiv.2109.00010,
title = {Exceptionally bright optical emission from a rare and distant $\gamma-$ray burst},
author = {Gor Oganesyan and Sergey Karpov and Martin Jelínek and Gregory Beskin and Samuele Ronchini and Biswajit Banerjee and Marica Branchesi and Jan Štrobl and Cyril Polášek and René Hudec and Eugeny Ivanov and Elena Katkova and Alexey Perkov and Anton Biryukov and Nadezhda Lyapshina and Vyacheslav Sasyuk and Martin Mašek and Petr Janeček and Jan Ebr and Jakub Juryšek and Ronan Cunniffe and Michael Prouza},
journal= {arXiv preprint arXiv:2109.00010},
year = {2023}
}