高能暂现源 · 每日文献综述

Motivated by the confirmed multimessenger event GW170817/GRB 170817A, we carry out an archival search for temporal and spatial associations between gamma-ray bursts (GRBs) and both significant and subthreshold gravitational wave (GW) candidates reported in the public search products of GWTC-2.1, GWTC-3, and GWTC-4.0. GRB trigger times and sky positions are taken from the GRBweb compilation of Swift-BAT and Fermi-GBM. GW candidates from the search pipelines are correlated with GRBs using time windows from 1 s to 10<SUP>3</SUP> s and spatial consistency tests based on the released sky-localization maps. We find no statistically significant GW─GRB associations on short timescales comparable to that of GW170817/GRB 170817A. The closest temporal connection is found between GRB 231126A and the GW candidate 231126_010928, with a delay of ∆t = 164.692 s, and with the GRB localization overlapping a high-probability region of the GW skymap. From the associated three-dimensional BAYESTAR localization, we infer a luminosity distance of <inline-formula> <mml:math><mml:msub><mml:mrow><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mi>L</mml:mi></mml:mrow></mml:msub><mml:mo>=</mml:mo><mml:mn>395</mml:mn><mml:msubsup><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mo>−</mml:mo><mml:mn>1970</mml:mn></mml:mrow><mml:mrow><mml:mo>+</mml:mo><mml:mn>2497</mml:mn></mml:mrow></mml:msubsup></mml:math> </inline-formula> Mpc (90% credible interval). For this candidate, we additionally performed Bayesian parameter estimation using Bilby with Markov Chain Monte Carlo sampling to obtain posterior parameters.