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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 16.

Comparison between the radio upper limits for EP260321a (downward red triangles) versus the radio luminosity of multiple classes of energetic transients, including GRBs (A. M. Soderberg et al. 2006; P. Chandra & D. A. Frail 2012; T. Laskar et al. 2022; D. A. Perley et al. 2025; R. Ricci et al. 2025), jetted tidal disruption events (B. A. Zauderer et al. 2011; I. Andreoni et al. 2022), and fast blue optical transients (A. Y. Q. Ho et al. 2019, 2020; R. Margutti et al. 2019; D. L. Coppejans et al. 2020). The figure is reproduced from B. O’Connor et al. (2025b).

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