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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 15.

Observer-frame X-ray afterglow (0.3–10 keV) lightcurves of GRBs and FXTs. The X-ray upper limits from Chandra for EP260321a are shown as downward red triangles. For comparison, we show both long and short GRBs (gray) from Swift (P. A. Evans et al. 2007, 2009), and specifically highlight a sample of low-luminosity GRBs. Additional X-ray data for GRBs 060218 and 100316D are compiled from A. M. Soderberg et al. (2006) and R. Margutti et al. (2013a). Pre-Swift GRB and XRF X-ray afterglows are reproduced from E. Pian et al. (1999, 2000, 2004), C. Kouveliotou et al. (2004), A. Tiengo et al. (2004), D. Watson et al. (2004) and references therein. X-ray upper limits for non-GRB-associated SNe Ic-BL (orange downward triangles) were obtained from T. O’Dwyer et al. (2026).

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