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On the Nature of Einstein Probe Transient EP250916a: Insights from X-Ray, Optical, and Radio Observations

  • Authors: Gaurava K. Jaisawal, Giulia Illiano, Francesco Carotenuto, Astrid L. Bouquin, David M. Russell, Giorgos Leloudas, Andrea Sanna, Dalya Akl, Rob Fender, Sara Motta

Gaurava K. Jaisawal et al 2026 The Astrophysical Journal 1005 .

  • Provider: AAS Journals

Caption: Figure 2.

Left: Swift/XRT light curves of EP250916a in the 0.5–1.5 keV (soft; blue circles), 1.5–10 keV (hard; red squares), and 0.5–10 keV (full; green diamonds) bands (top), with the corresponding hardness ratio (HR = 1.5–10 keV/0.5–1.5 keV) shown below. Each point represents a single Swift/XRT observation. Right: hardness–intensity diagram illustrating the spectral evolution of EP250916a during the outburst, color coded by time (MJD).

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