Hybrid Strategy for Coordinated Interstellar Signaling: Linking the Galactic Center and Extragalactic Bursts
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866916969635119104 |
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| author | Seto, Naoki |
| author_facet | Seto, Naoki |
| contents | The search for extraterrestrial intelligence (SETI) is largely limited by the vastness of the signaling parameter space. The concurrent signaling scheme offers a framework in which civilizations can coordinate their transmission and reception by referring to a common astrophysical event. Building on this idea, I propose a hybrid strategy that combines the Galactic Center as a spatial reference with an extragalactic burst as a temporal marker. If such a scheme is indeed employed, the sky area to be surveyed in SETI could be reduced by more than two orders of magnitude, based solely on existing astronomical data. I examine records of three types of extragalactic bursts (supernovae, neutron star mergers, and gamma-ray bursts [GRBs]) to identify suitable temporal markers. Among them, GRB 221009A is particularly notable due to its high fluence and favorable sky location. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_20718 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Hybrid Strategy for Coordinated Interstellar Signaling: Linking the Galactic Center and Extragalactic Bursts Seto, Naoki Instrumentation and Methods for Astrophysics High Energy Astrophysical Phenomena Popular Physics The search for extraterrestrial intelligence (SETI) is largely limited by the vastness of the signaling parameter space. The concurrent signaling scheme offers a framework in which civilizations can coordinate their transmission and reception by referring to a common astrophysical event. Building on this idea, I propose a hybrid strategy that combines the Galactic Center as a spatial reference with an extragalactic burst as a temporal marker. If such a scheme is indeed employed, the sky area to be surveyed in SETI could be reduced by more than two orders of magnitude, based solely on existing astronomical data. I examine records of three types of extragalactic bursts (supernovae, neutron star mergers, and gamma-ray bursts [GRBs]) to identify suitable temporal markers. Among them, GRB 221009A is particularly notable due to its high fluence and favorable sky location. |
| title | Hybrid Strategy for Coordinated Interstellar Signaling: Linking the Galactic Center and Extragalactic Bursts |
| topic | Instrumentation and Methods for Astrophysics High Energy Astrophysical Phenomena Popular Physics |
| url | https://arxiv.org/abs/2509.20718 |