XL-Calibur measured a 19-64 keV polarization degree of 5.0(+2.7/-3.0)% and angle -28 +/- 17 degrees for Cygnus X-1, consistent with IXPE and jet alignment, though with only 8.7% chance probability.
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XL-Calibur Polarimetry of Cyg X-1 Further Constrains the Origin of its Hard-state X-ray Emission
XL-Calibur measured a 19-64 keV polarization degree of 5.0(+2.7/-3.0)% and angle -28 +/- 17 degrees for Cygnus X-1, consistent with IXPE and jet alignment, though with only 8.7% chance probability.