NuSTAR View of the 2025 Mini-Outburst of the Black Hole X-ray Binary GRS 1739-278: Spectral and Timing Evolution in the Soft State
The episode discusses a study of GRS 1739-278's 2025 mini-outburst, focusing on its soft state evolution. Researchers found that while the disk cooled and dimmed, the physical inner radius remained stable at the Innermost Stable Circular Orbit (R_ISCO). The data suggests a high-spin black hole operating under predictable conditions.