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First Results from the PanRadio Gamma-Ray Burst Collaboration: The 400-day Afterglow of GRB 230815A

Authors: James K. Leung, Gemma E. Anderson, Alexander J. van der Horst, Claire Morley, Benjamin Schneider, Fabio De Colle, Om Sharan Salafia, Giancarlo Ghirlanda, Sarah I. Chastain, Adelle J. Goodwin, Ashna Gulati, Lauren Rhodes, Stuart D. Ryder, Ashley A. Chrimes, Valerio D'Elia, Mathieu de Bony de Lavergne, Massimiliano De Pasquale, Antonio de Ugarte Postigo, Dieter H. Hartmann, Benjamin P. Gompertz, Andrew J. Levan, Tara Murphy, Gavin P. Rowell, Thomas D. Russell, Fabian Schüssler, Rhaana L. C. Starling, Nial R. Tanvir, Susanna D. Vergani, Ralph A. M. J. Wijers

James K. Leung et al 2026 The Astrophysical Journal Letters 997 .

Provider: AAS Journals

Caption: Figure 6.

The half-opening angle of the wider component θ_j,w (in degrees) as a function of the jet break t_j,w (days) and isotropic-equivalent kinetic energy E_k,iso,w (erg). The dashed lines indicate the combinations of t_j,w and E_k,iso,w that will yield θ_j,w of 45°, 60°, and 75°. We assume here the redshift and CBM density from Equation (9), effectively performing a relative scaling from the 2﹩\mathop{.}\limits^{\unicode{x000b0}}﹩1 narrow jet.

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