Table 1.
Spectral parameters from the VHE and X-ray observations around the three IXPE observing epochs.
| IXPE 1 | IXPE 2 | IXPE 3 | ||
|---|---|---|---|---|
| MAGIC | MJD | 59703.5 to 59705.5 | 59734.5 to 59735.5 | – |
| Flux | 0.34 ± 0.01 | 0.67 ± 0.03 | – | |
| α | −2.64 ± 0.06 | −2.30 ± 0.08 | – | |
| χ2/d.o.f. | 25.0/13 | 2.5/9 | – | |
| Swift-XRT | MJD | 59703.55 59704.02 59704.62 | 59734.92 59735.00 59736.27 | 59737.58 59738.25 |
| Flux |
 |
 |
 |
|
| α |
 |
 |
 |
|
| χ2/d.o.f. | 223.5/197 236.1/216 225.4/220 | 261.5/266 241.9/223 346.3/309 | 549.0/481 218.6/199 | |
| XMM-Newton | MJD | 59703.93 to 59704.13 | 59734.68 to 59735.11 | – |
| Flux |
 |
 |
– | |
| α |
 |
 |
– | |
| χ2/d.o.f. | 814.8/329 | 2082.13/345 | – | |
| NuSTAR | MJD | – | 59734.65 to 59735.11 | 59737.53 to 59738.04 |
| Flux | – | 0.968 ± 0.004 | 2.693 ± 0.006 | |
| α | – | −2.309 ± 0.007 | −1.913 ± 0.004 | |
| χ2/d.o.f. | – | 704.7/761 | 1143.8/1133 | |
Notes. The table contains four primary rows corresponding to the different instruments. The first subrow for an individual instrument shows the MJD of the observations performed during the three IXPE observations given by the main columns. The second subrow contains the obtained fluxes in units of 10−10 erg cm−2 s−1 (for MAGIC the integrated photon flux between 200 GeV and 1 TeV is used, for Swift-XRT and XMM-Newton the flux between 2–10 keV and for NuSTAR the 3–7 keV flux). The spectral index α, assuming a log-parabola for MAGIC (with β fixed to 0.50 and reference energy of 300 GeV) as well as for Swift-XRT (with β fixed to 0.29 and reference energy of 1 keV), XMM-Newton (with β fixed to 0.20 and reference energy of 1 keV), and NuSTAR (with β fixed to 0.45 and reference energy of 1 keV) is given in the third subrow. The last subrow gives the χ2/d.o.f. Regarding XMM-Newton and NuSTAR, the parameters were obtained by fitting jointly the data from the available cameras on board these observatories (i.e., EPIC-pn and EPIC-MOS2 for XMM-Newton, FPMA and FPMB for NuSTAR).
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