GstLAL O4 Online Results Paper
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| author | Adhicary, Shomik Baral, Pratyusava Baylor, Amanda Ewing, Becca Huang, Yun-Jing Huxford, Rachael Joshi, Prathamesh Kennington, James Magee, Ryan Messick, Cody Niu, Wanting Posnansky, Cort Sachdev, Surabhi Sakon, Shio Shah, Urja Singh, Divya Tsukada, Leo Yarbrough, Zach Zhang, Noah Cannon, Kipp Caudill, Sarah Cousins, Bryce Creighton, Jolien D. E. Fong, Heather George, Richard N. Godwin, Olivia Harada, Reiko Kuwahara, Soichiro Li, Alvin K. Y. Meacher, Duncan Morisaki, Soichiro Mukherjee, Debnandini Pace, Alexander Ray, Anarya Schmidt, Stefano Tapia, Ron Ueno, Koh Viets, Aaron Wade, Leslie Wade, Madeline Woan, Graham Hanna, Chad |
| author_facet | Adhicary, Shomik Baral, Pratyusava Baylor, Amanda Ewing, Becca Huang, Yun-Jing Huxford, Rachael Joshi, Prathamesh Kennington, James Magee, Ryan Messick, Cody Niu, Wanting Posnansky, Cort Sachdev, Surabhi Sakon, Shio Shah, Urja Singh, Divya Tsukada, Leo Yarbrough, Zach Zhang, Noah Cannon, Kipp Caudill, Sarah Cousins, Bryce Creighton, Jolien D. E. Fong, Heather George, Richard N. Godwin, Olivia Harada, Reiko Kuwahara, Soichiro Li, Alvin K. Y. Meacher, Duncan Morisaki, Soichiro Mukherjee, Debnandini Pace, Alexander Ray, Anarya Schmidt, Stefano Tapia, Ron Ueno, Koh Viets, Aaron Wade, Leslie Wade, Madeline Woan, Graham Hanna, Chad |
| contents | Gravitational-wave observations of merging binary neutron stars and black holes are now routinely made by detectors in the Advanced LIGO-Virgo-KAGRA network. Neutron star binary systems may also produce detectable electromagnetic and particle emission over times scales ranging from seconds to years. Real-time gravitational-wave searches play a central role in enabling time-critical electromagnetic and/or neutrino follow-up observations. During the fourth observing run (O4) of the Advanced LIGO-Virgo-KAGRA network, multiple real-time searches operated continuously to identify candidate gravitational-wave events and publicly disseminate information about these discoveries. Here, the performance and results of the GstLAL real-time analysis are reported. The analysis is designed to identify candidates with low latency, high detection efficiency, and sustained operational uptime over long observing periods. Across O4, it produced initial candidate uploads with a median latency of 15.8 s while maintaining an effective uptime of 98% during the first two parts of the observing run. During the run, the analysis contributed to 250 candidates classified as astrophysically plausible, provided the first upload for 222 of these, and was the sole contributor for 75. Among Gravitational-Wave Transient Catalog events with a false-alarm rate below one per year, 88% were identified as significant in low latency and promoted for expert vetting and public dissemination. The low-latency astrophysical classifications agreed with the final catalog classifications for 93% of the events considered. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_19153 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | GstLAL O4 Online Results Paper Adhicary, Shomik Baral, Pratyusava Baylor, Amanda Ewing, Becca Huang, Yun-Jing Huxford, Rachael Joshi, Prathamesh Kennington, James Magee, Ryan Messick, Cody Niu, Wanting Posnansky, Cort Sachdev, Surabhi Sakon, Shio Shah, Urja Singh, Divya Tsukada, Leo Yarbrough, Zach Zhang, Noah Cannon, Kipp Caudill, Sarah Cousins, Bryce Creighton, Jolien D. E. Fong, Heather George, Richard N. Godwin, Olivia Harada, Reiko Kuwahara, Soichiro Li, Alvin K. Y. Meacher, Duncan Morisaki, Soichiro Mukherjee, Debnandini Pace, Alexander Ray, Anarya Schmidt, Stefano Tapia, Ron Ueno, Koh Viets, Aaron Wade, Leslie Wade, Madeline Woan, Graham Hanna, Chad General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics Gravitational-wave observations of merging binary neutron stars and black holes are now routinely made by detectors in the Advanced LIGO-Virgo-KAGRA network. Neutron star binary systems may also produce detectable electromagnetic and particle emission over times scales ranging from seconds to years. Real-time gravitational-wave searches play a central role in enabling time-critical electromagnetic and/or neutrino follow-up observations. During the fourth observing run (O4) of the Advanced LIGO-Virgo-KAGRA network, multiple real-time searches operated continuously to identify candidate gravitational-wave events and publicly disseminate information about these discoveries. Here, the performance and results of the GstLAL real-time analysis are reported. The analysis is designed to identify candidates with low latency, high detection efficiency, and sustained operational uptime over long observing periods. Across O4, it produced initial candidate uploads with a median latency of 15.8 s while maintaining an effective uptime of 98% during the first two parts of the observing run. During the run, the analysis contributed to 250 candidates classified as astrophysically plausible, provided the first upload for 222 of these, and was the sole contributor for 75. Among Gravitational-Wave Transient Catalog events with a false-alarm rate below one per year, 88% were identified as significant in low latency and promoted for expert vetting and public dissemination. The low-latency astrophysical classifications agreed with the final catalog classifications for 93% of the events considered. |
| title | GstLAL O4 Online Results Paper |
| topic | General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2605.19153 |