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EP260321a/SN 2026gzf: The Faintest Shock Breakout Associated with a Broad-lined Supernova

  • Authors: Brendan O'Connor, Xander J. Hall, Malte Busmann, Daniel Gruen, Alberto Floris, Tomás Cabrera, Ziyuan Zhu, Antonella Palmese, Dylan Green, John Banovetz, Julius Gassert, Christopher L. Fryer, Roberto Ricci, Eleonora Troja, Surya Shivaprasad, Gregory R. Zeimann, Ariel J. Amsellem, Stephen Bailey, Segev BenZvi, Simone Dichiara, Hendrik van Eerten, Jeremy Hare, Lei Hu, Christopher M. Irwin, Keerthi Kunnumkai, Konstantin Malanchev, Mitra Maleki, Michael J. Moss, Adam D. Myers, Dheeraj Pasham, Christoph Ries, Geoffrey Ryan, David Schlegel, Michael Schmidt, Silona Wilke, Yu-Han Yang

Brendan O’Connor et al 2026 The Astrophysical Journal Letters 1006 .

  • Provider: AAS Journals

Caption: Figure 18.

Allowed parameter space (shaded regions) for afterglow nondetection, assuming a Gaussian-structured jet, at 158 Mpc (z = 0.0344). Left: allowed values of the density A* vs. the isotropic-equivalent kinetic energy at the jet’s core Ekin for different viewing angles θv/θc. We have fixed θc = 0.15 rad, εe = 0.1, εB = 0.01, p = 2.2, and Γ0 = 100. Right: similar to the left panel but instead as a function of εB for fixed Ekin = 1048 erg.

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