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We searched for periodic and quasiperiodic signal in the prompt emission of asample of 44 bright short gamma-ray bursts detected with Fermi/GBM, Swift/BAT,and CGRO/BATSE. The aim was to look for the observational signature ofquasiperiodic jet precession which is expected from black hole-neutron starmergers, but not from double neutron star systems. Thus, this kind of searchholds the key to identify the progenitor systems of short GRBs and, in the waitfor gravitational wave detection, represents the only direct way to constrainthe progenitors. We tailored our search to the nature of the expected signal byproperly stretching the observed light curves by an increasing factor withtime, after calibrating the technique on synthetic curves. In none of the GRBsof our sample we found evidence for periodic or quasiperiodic signals. Inparticular, for the 7 unambiguously short GRBs with best S/N we obtainedsignificant upper limits to the amplitude of the possible oscillations. Thisresult suggests that BH-NS systems do not dominate the population of short GRBprogenitors as described by the kinematic model of Stone, Loeb, & Berger(2013).

A search for pulsations in short gamma-ray bursts to constrain their progenitors