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GW170817 is the only gravitational-wave (GW) event, for which a confirmed{\gamma}-ray counterpart, GRB 170817A, has been detected. Here we present amethod to search for another type of {\gamma}-ray signal, a {\gamma}-ray burstprecursor, associated with a compact binary merger. If emitted shortly beforethe coalescence, a high-energy electromagnetic (EM) flash travels through ahighly dynamical and relativistic environment, created by the two compactobjects orbiting each other. Thus, the EM signal arriving at an Earth observercould present a somewhat predictable time-dependent modulation. We describe atargeted 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 onsimulated signals added to GBM data. The method is then applied to a selectionof potentially interesting compact binary mergers detected during the second(O2) and third (O3) observing runs of Advanced LIGO and Advanced Virgo. We findno significant modulated {\gamma}-ray precursor signal associated with any ofthe considered events.

Searches for Modulated {\gamma}-Ray Precursors to Compact Binary Mergers in Fermi-GBM Data