Sengupta, Anand et al.Anand et al.Sengupta2025-08-302025-08-302017-06-1510.1103/PhysRevD.95.1220032-s2.0-85022327286https://repository.iitgn.ac.in/handle/IITG2025/22459Results are presented from a semicoherent search for continuous gravitational waves from the brightest low-mass X-ray binary, Scorpius X-1, using data collected during the first Advanced LIGO observing run. The search combines a frequency domain matched filter (Bessel-weighted F-statistic) with a hidden Markov model to track wandering of the neutron star spin frequency. No evidence of gravitational waves is found in the frequency range 60-650 Hz. Frequentist 95% confidence strain upper limits, h095%=4.0×10-25, 8.3×10-25, and 3.0×10-25 for electromagnetically restricted source orientation, unknown polarization, and circular polarization, respectively, are reported at 106 Hz. They are ≤10 times higher than the theoretical torque-balance limit at 106 Hz.falseArticlehttp://link.aps.org/pdf/10.1103/PhysRevD.95.1220032470002915 June 20176469WOS:000404474900001