ausblenden:
Schlagwörter:
Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE,General Relativity and Quantum Cosmology, gr-qc
Zusammenfassung:
We present the results of the search for gravitational waves (GWs) associated
with gamma-ray bursts (GRBs) detected during the first observing run of the
Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO), which took
place between September 12, 2015 and January 19, 2016. We perform a modeled
search for coalescences of either two neutron stars (NSs) or an NS and a
stellar-mass black hole (BH), and a search for unmodeled GW transients using
minimal assumptions about the signal morphology. We search for GW signals
associated with the 41 GRBs for which LIGO data are available with sufficient
duration. We find no evidence of a GW signal for any of them. For all GRBs, we
place lower bounds on the distance to the source using the optimistic
assumption that GWs with an energy of $10^{-2}M_\odot c^2$ were emitted at a
given frequency, and find a median 90% confidence limit of 71Mpc at 150Hz. For
the subset of 19 short-hard GRBs, we place lower bounds on distance with a
median 90% confidence limit of 90Mpc for NS-NS coalescences, and 150Mpc and
139Mpc for NS-BH coalescences with spins aligned to the orbital angular
momentum and in a generic configuration, respectively. These distance limits
are higher than any other ones placed by previous GW searches. Further, we
discuss in detail the results of the search for GWs associated with GRB
150906B, a GRB that was localized by the InterPlanetary Network near the local
galaxy NGC 3313, which is at a luminosity distance of 54Mpc (z=0.0124).
Assuming the gamma-ray emission is beamed with a jet half-opening angle $\leq
30^{\circ}$, we exclude an NS-NS and an NS-BH in NGC 3313 as the progenitor of
this event with confidence >99%. In addition, under the same assumption for the
jet half-opening angle, we found no evidence for an NS-NS and an NS-BH GW
signal associated with GRB 150906B up to a distance of 102Mpc and 170Mpc,
respectively.