Searches for Modulated γ-Ray Precursors to Compact Binary Mergers in Fermi-GBM Data
| Autor: | Cosmin Stachie, Tito Dal Canton, Nelson Christensen, Marie-Anne Bizouard, Michael Briggs, Eric Burns, Jordan Camp, Michael Coughlin |
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| Rok vydání: | 2022 |
| Předmět: |
High Energy Astrophysical Phenomena (astro-ph.HE)
Space and Planetary Science Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astronomy and Astrophysics General Relativity and Quantum Cosmology (gr-qc) Astrophysics - High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology |
| Zdroj: | The Astrophysical Journal. 930:45 |
| ISSN: | 1538-4357 0004-637X |
| Popis: | GW170817 is the only gravitational-wave event for which a confirmed γ-ray counterpart, GRB 170817A, has been detected. Here, we present a method to search for another type of γ-ray signal, a γ-ray burst precursor, associated with a compact binary merger. If emitted shortly before the coalescence, a high-energy electromagnetic (EM) flash travels through a highly dynamical and relativistic environment, created by the two compact objects orbiting each other. Thus, the EM signal arriving at an Earth observer could present a somewhat predictable time-dependent modulation. We describe a targeted search method for light curves exhibiting such a modulation, parameterized by the observer-frame component masses and binary merger time, using Fermi-GBM data. The sensitivity of the method is assessed based on simulated signals added to GBM data. The method is then applied to a selection of potentially interesting compact binary mergers detected during the second (O2) and third (O3) observing runs of Advanced LIGO and Advanced Virgo. We find no significant modulated γ-ray precursor signal associated with any of the considered events. |
| Databáze: | OpenAIRE |
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