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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 3.

Lightcurve shape relative to peak brightness for SN 2026gzf (black) versus GRB-SNe (SNe 1998bw, 2006aj, 2010bh, and 2017iuk; T. J. Galama et al. 1998; S. Campana et al. 2006b; J. Sollerman et al. 2006; R. L. C. Starling et al. 2011; V. D’Elia et al. 2018; L. Izzo et al. 2019) and FXT-SNe (SNe 2008D, 2025 kg and 2025wkm; A. M. Soderberg et al. 2008; R. A. J. Eyles-Ferris et al. 2025; J. C. Rastinejad et al. 2025; G. P. Srinivasaragavan et al. 2025a, 2025b). The data are presented in either the r or R filters, and time has been converted to the rest frame.

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