Presently agreed progenitor scenarios for short gamma - ray bursts ( short GRBs ) include coalescences of two neutron stars or of a neutron star and a black hole as well, which would necessarily be accompanied by the emission of strong gravitational waves. We present here a search for these known gravitational - wave signatures in both temporal and directional coincidence with 22 GRBs for which we have sufficient gravitational - wave data available in multiple instruments during LIGO’ s fifth science run, S 5, and Virgo’ s first science run, VSR 1. In our analysis we find no statistically significant gravitational - wave candidates within a [ -5, +1 ) s temporal window around the trigger time of any considered GRB. Furthermore, by using the Wilcoxon – Mann – Whitney U - test, we find no evidence for an excess of weak gravitational - wave signals in our sample of GRBs. As a conclusion we exclude neutron star – black hole progenitors to a median 90 % confidence exclusion distance of 6.7 Mpc.

Search for Gravitational-wave inspiral signals associated with short gamma-ray bursts during LIGO's fifth and Virgo's first science run

CESARINI, ELISABETTA;GUIDI, GIANLUCA MARIA;MARTELLI, FILIPPO;PIERGIOVANNI, FRANCESCO;STURANI, RICCARDO;VETRANO, FLAVIO;VICERE', ANDREA;
2010-01-01

Abstract

Presently agreed progenitor scenarios for short gamma - ray bursts ( short GRBs ) include coalescences of two neutron stars or of a neutron star and a black hole as well, which would necessarily be accompanied by the emission of strong gravitational waves. We present here a search for these known gravitational - wave signatures in both temporal and directional coincidence with 22 GRBs for which we have sufficient gravitational - wave data available in multiple instruments during LIGO’ s fifth science run, S 5, and Virgo’ s first science run, VSR 1. In our analysis we find no statistically significant gravitational - wave candidates within a [ -5, +1 ) s temporal window around the trigger time of any considered GRB. Furthermore, by using the Wilcoxon – Mann – Whitney U - test, we find no evidence for an excess of weak gravitational - wave signals in our sample of GRBs. As a conclusion we exclude neutron star – black hole progenitors to a median 90 % confidence exclusion distance of 6.7 Mpc.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11576/2303311
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