Einstein Probe spots enigmatic double X-ray burst with no gamma rays
China's Einstein Probe detected a mysterious X-ray transient EP240305a that produced two closely spaced X-ray flares about 200 seconds apart, with no corresponding gamma-ray emission. Multiwavelength follow-up showed the X-rays fading in days and radio fading over weeks, leaving scientists classifying the event as a gamma-ray-dark GRB-like transient or an extragalactic fast X-ray transient; the true origin remains uncertain, possibly due to jet orientation or gamma-ray obscuration.