A theoretical model of an off-axis GRB jet
37TH INTERNATIONAL COSMIC RAY CONFERENCE, ICRC2021(2022)
Abstract
In light of the most recent observations of late afterglows produced by the merger of compact objects or by the core-collapse of massive dying stars, we research the evolution of the afterglow produced by an off-axis top-hat jet and its interaction with a surrounding medium. The medium is parametrized by a power law distribution of the form n(r) alpha r(-k) is the stratification parameter and contains the development when the surrounding density is constant (k = 0) or wind-like (k = 2). We develop an analytical synchrotron forward-shock model when the outflow is viewed off-axis, and it is decelerated by a stratified medium. Using the X-ray data points collected by a large campaign of orbiting satellites and ground telescopes, we have managed to apply our model and fit the X-ray spectrum of the GRB afterglow associated to SN 2020bvc with conventional parameters. Our model predicts that its circumburst medium is parametrized by a power law with stratification parameter k = 1.5
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Key words
off-axis
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