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A Multiwavelength View of the First Type Ic-BL Supernova with an Einstein Probe X-Ray Shock Breakout

  • Authors: Jillian C. Rastinejad, Gokul Srinivasaragavan, Nikhil Sarin, Tanner O'Dwyer, S. Bradley Cenko, James K. Leung, Anya E. Nugent, Daniel A. Perley, Genevieve Schroeder, Shreya Anand, Tomás Ahumada, Igor Andreoni, Aleksandra Bochenek, Alessandra Corsi, Christoffer Fremling, Anna Y. Q. Ho, Mansi M. Kasliwal, Geoffrey Mo, Anirudh Salgundi, Kendall I. Sippy, J. Sollerman, Eric C. Bellm, Tracy X. Chen, Michael W. Coughlin, Michael C. Davis, Fabio De Colle, Danielle Frostig, Christopher L. Fryer, Michael J. Graham, Xander J. Hall, K.-R. Hinds, Luca Izzo, Wynn Jacobson-Galán, Nathan P. Lourie, Keiichi Maeda, Josiah Purdum, Ben Rusholme, Avinash Singh, Robert Stein

Jillian C. Rastinejad et al 2026 The Astrophysical Journal Letters 1007 .

  • Provider: AAS Journals

Caption: Figure 1.

Comparison of the X-ray properties of EP 260321a from the GCNs (Q. J. Huang et al. 2026a) against the X-ray light curves of other SESNe (P. A. Evans et al. 2007, 2009; A. Y. Q. Ho et al. 2020; H. Sun et al. 2025; G. P. Srinivasaragavan et al. 2025a, 2025b). With the exception of SBO XRF 080109, EP 260321a is the least luminous FXT, peaking several orders of magnitude below FXTs associated with on-axis relativistic jets.

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