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- W4387561467 abstract "We report on the coordinated observations of the neutron star low-mass X-ray binary (NS-LMXB) gx in X-rays (IXPE, NICER, Nustar and INTEGRAL), optical (REM and LCO), near-infrared (REM), mid-infrared (VLT VISIR), and radio (ATCA). This Z-source was observed by IXPE twice in March-April 2023 (Obs. 1 and 2). In the radio band, the source was detected, but only upper-limits to the linear polarization were obtained at a $3sigma$ level of $6.1%$ at 5.5 GHz and $5.9%$ at 9 GHz in Obs.~1 and $12.5%$ at 5.5~GHz and $20%$ at 9~GHz in Obs.~2. The mid-IR, near-IR and optical observations suggest the presence of a compact jet which peaks in the mid- or far-IR. The X-ray polarization degree was found to be $3.7% pm 0.4 %$ (at $90%$ confidence level) during Obs.~1 when the source was in the horizontal branch of the Z-track and $1.8% pm 0.4 %$ during Obs.~2 when the source was in the normal-flaring branch. These results confirm the variation of polarization degree as a function of the position of the source in the color-color diagram as for previously observed Z-track sources (Cyg~X-2 and XTE~1701$-$462). Evidence for a variation of the polarization angle $sim 20^circ$ with energy is found in both observations, likely related to the different, non-orthogonal polarization angles of the disk and Comptonization components which peak at different energies." @default.
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