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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 1.

Finding chart of EP260321a/SN 2026gzf using DECam imaging in the g and i filters. Archival pre-explosion DECam images from 2013 (13 yr before discovery) are shown in the top panels, while the bottom panels show imaging obtained on 2026 March 25 (T0 + 3.6 days). A blue point source (g − i ≈ −1.3 mag) is visible at the location of the transient in archival imaging (see Appendix C). The transient explosion site (red crosshairs) is offset by 3﹩\mathop{.}\limits^{{\unicode{x02033}}}﹩4 from the center of the host galaxy (blue cross), corresponding to 2.5 kpc at z = 0.0344.

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