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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 5.

Time evolution of the injection (ν_m; red lines) and self-absorption (ν_a; blue lines) frequencies from 100 random posterior samples of the evolving synchrotron spectrum model of Section 3.4. The gray dotted-dashed lines show the expected evolutions of the two frequencies in the self-similar phase of an R. D. Blandford & C. F. McKee (1976) blast wave (valid for a homogenous ISM environment), as given in J. Granot & R. Sari (2002), assuming p = 2.6. The dotted line shows t^1/2, which approximates the initial evolution of ν_a.

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