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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 17.

Cumulative distribution of oxygen abundances for low-redshift (z < 0.2) SNe Ic-BL without detected GRBs (blue) and GRB-SN Ic-BL events (red), compiled from the PP04 O3N2 (M. Pettini & B. E. J. Pagel 2004) measurements from J. Japelj et al. (2018) and M. Modjaz et al. (2020), and local (z < 0.025) SNe Ib and Ic (gray) from M. Modjaz et al. (2011), R. Ganss et al. (2022, 2025) converted to the PP04 O3N2 scale. The metallicity at the explosion sites of EP260321a and SN 2008D is shown as a dashed vertical line.

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