Discovery of a 584.65 Hz Burst Oscillation in the Low-mass X-Ray Binary 4U 1730–22

Type-I X-ray burst oscillations are powered by thermonuclear released on the neutron star (NS) surface in low mass binaries (LMXBs), where oscillation frequencies close to NS spin rates. In this work, we report detection of at 584.65 Hz during cooling tail a type-I bursts observed from accreting LMXB 4U~1730--22 2022 March 20, \textit{ Neutron Interior Composition Explorer} (\textit{NICER}) telescope. The signal showed strong Leahy power, $P_{\rm m}\sim54.04$, around Hz, which has single trial and multiple trials confidence levels $7.05\sigma$ $4.78\sigma$, respectively. folded pulse profile 0.2--10 keV band sinusoidal shape with fraction amplitude rms $(12.5\pm1.8)\%$. We found frequency insignificant upward drifting, i.e., less than 0.3 tail, similar as behavior appearing millisecond pulsars (AMXP), indicate source could be an AMXP spinning 1.71 ms.