In-flight calibration of the INTEGRAL/IBIS Compton mode - Application to the Crab Nebula polarization

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Table 1.

Summary of 21st century high-energy polarization measurements of the Crab, in chronological order of observation.

Instrument	Energy (keV)	PA (°)	PF (%)
SPI¹	130–436	120 ± 6	24 ± 4
IBIS²	200–800	100 ± 11	47 ± 13
Hitomi/SGD³	60–160	110 ± 13	22± 10
AstroSat/CZTI⁴	100–380	143.5 ± 2.8	39 ± 10
PoGo+⁵	18–160	131.3 ± 6.8	20.9 ± 5.0
PolarLight⁶	3–4.5	145.8 ± 5.7	15.3 ± 3.1
IXPE⁷	2–8	145.5 ± 0.29	19.0 ± 0.2
XL-Calibur⁸	19–64	129.8 ± 3.2°	25.1 ± 2.9

Notes. ¹Dean et al. (2008), revisited by Jourdain & Roques (2019); ²Forot et al. (2008); ³ Hitomi Collaboration (2018); ⁴ Vadawale et al. (2017); ⁵ Chauvin et al. (2018); ⁶ Feng et al. (2020); ⁷Bucciantini et al. (2023); ⁸ Awaki et al. (2025)

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