Learn about gravitational wave standard sirens and catalog methods in the upcoming O4 observing run through this research seminar presented at the ICTP-SAIFR Program on "Fundamental Physics meets Current and Future Facilities in Cosmology." Explore cutting-edge research from the Centro Brasileiro de Pesquisas Físicas as the speaker delves into advanced techniques for analyzing gravitational wave data and their implications for cosmological measurements. Gain insights into how standard siren methods are being developed and applied to extract cosmological information from gravitational wave observations in the next generation of detectors.