A theoretical model of an off-axis GRB jet

B. Betancourt Kamenetskaia, N. Fraija, M. Dainotti, A. Gálvan-Gámez, R. Barniol Duran, S. Dichiara

Research output: Contribution to journalConference articlepeer-review

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) ∝ r-kis 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.

Original languageEnglish (US)
Article number661
JournalProceedings of Science
Volume395
StatePublished - Mar 18 2022
Event37th International Cosmic Ray Conference, ICRC 2021 - Virtual, Berlin, Germany
Duration: Jul 12 2021Jul 23 2021

All Science Journal Classification (ASJC) codes

  • General

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