Fig. 5.

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Multi-wavelength light curves during the multi-hour exposure from MAGIC and XMM-Newton on MJD 60291 (December 13, 2023). The MAGIC fluxes are calculated above 400 GeV and binned over 25-minute intervals. The XMM-Newton fluxes are computed in the same 25-minute bins as MAGIC, and in the 0.3–2 keV and 2–10 keV bands. In the third panel from the top we show the hardness ratio (F2 − 10 keV/F0.3 − 2 keV) from the XMM-Newton data. The bottom panels show the optical (R-band) fluxes, and the polarization in the radio and optical (R-band) with the same binning as in Fig. 1. The black markers represent the X-ray polarization from IXPE binned over 3 h intervals.
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