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- W4225991043 abstract "GW170817 is the only gravitational-wave (GW) event, for which a confirmed {gamma}-ray counterpart, GRB 170817A, has been detected. Here we present a method to search for another type of {gamma}-ray signal, a {gamma}-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 lightcurves 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 {gamma}-ray precursor signal associated with any of the considered events." @default.
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- W4225991043 date "2021-12-08" @default.
- W4225991043 modified "2023-09-27" @default.
- W4225991043 title "Searches for Modulated {gamma}-Ray Precursors to Compact Binary Mergers in Fermi-GBM Data" @default.
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