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Article Dans Une Revue Astrophys.J. Année : 2022

Searches for Modulated γ-Ray Precursors to Compact Binary Mergers in Fermi-GBM Data

Résumé

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.
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Dates et versions

hal-03664006 , version 1 (25-06-2022)

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Cosmin Stachie, Tito Dal Canton, Nelson Christensen, Marie-Anne Bizouard, Michael Briggs, et al.. Searches for Modulated γ-Ray Precursors to Compact Binary Mergers in Fermi-GBM Data. Astrophys.J., 2022, 930 (1), pp.45. ⟨10.3847/1538-4357/ac5f53⟩. ⟨hal-03664006⟩
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