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Sollerman, Keiichi Maeda, Kendall I. Sippy, K. -R. Hinds, Luca Izzo, Mansi M. Kasliwal, Michael C. Davis, Michael J. Graham, Michael W. Coughlin, Nathan P. Lourie, Nikhil Sarin, Robert Stein, S. Bradley Cenko, Shreya Anand, Tanner O'Dwyer, Tomas Ahumada, Tracy X. Chen, Wynn Jacobson-Galan, Xander J. Hall","submitted_at":"2026-06-08T18:01:54Z","abstract_excerpt":"In March 2026, the Einstein Probe (EP) discovered its most nearby (z = 0.0343) Fast X-ray Transient (FXT), EP260321a, the first EP FXT to provide a strong match to expectations for X-ray ''shock breakout'' (SBO) emission. Here, we present our multi-wavelength follow-up campaign of EP260321a and its broad-line Type Ic (Ic-BL) supernova (SN) counterpart, SN 2026gzf, the first Type Ic-BL SN with a definitive X-ray SBO. 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