Modeling Gamma-Ray Burst Afterglow Observations with an Off-axis Jet Emission

Author:

Fraija N.ORCID,Galvan-Gamez A.ORCID,Betancourt Kamenetskaia B.ORCID,Dainotti M. G.ORCID,Dichiara S.ORCID,Veres P.ORCID,Becerra R. L.ORCID,do E. S. Pedreira A. C. Caligula

Abstract

Abstract Gamma-ray bursts (GRBs) are fascinating extragalactic objects. They represent a fantastic opportunity to investigate unique properties not exhibited in other sources. Multiwavelength afterglow observations from some short- and long-duration GRBs reveal an atypical long-lasting emission that evolves differently from the canonical afterglow light curves favoring the off-axis emission. We present an analytical synchrotron afterglow scenario and the hydrodynamical evolution of an off-axis top-hat jet decelerated in a stratified surrounding environment. The analytical synchrotron afterglow model is shown during the coasting, deceleration (off- and on-axis emission), and post–jet break decay phases, and the hydrodynamical evolution is computed by numerical simulations showing the time evolution of the Doppler factor, the half-opening angle, the bulk Lorentz factor, and the deceleration radius. We show that numerical simulations are in good agreement with those derived with our analytical approach. We apply the current synchrotron model and successfully describe the delayed nonthermal emission observed in a sample of long and short GRBs with evidence of off-axis emission. Furthermore, we provide constraints on the possible afterglow emission by requiring the multiwavelength upper limits derived for the closest Swift-detected GRBs and promising gravitational-wave events.

Funder

UNAM ∣ Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México

Publisher

American Astronomical Society

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 8 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Possible X-ray cocoon emission from GRB 050709;Publications of the Astronomical Society of Japan;2024-05-15

2. Reverse shock emission in an off-axis top-hat jet model for gamma-ray bursts;Monthly Notices of the Royal Astronomical Society;2024-01-18

3. Off-axis Afterglow Closure Relations and Fermi-LAT Detected Gamma-Ray Bursts;The Astrophysical Journal;2023-11-17

4. An explanation of GRB Fermi-LAT flares and high-energy photons in stratified afterglows;Monthly Notices of the Royal Astronomical Society;2023-11-06

5. Evolution of double oxygen–neon white dwarf merger remnant;Monthly Notices of the Royal Astronomical Society;2023-09-07

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