Table C.1
Comparison of parameter values for the best-fits of the native tools (fermitools+minuit/migrad for Fermi-LAT data, xspec’s Levenberg- Marquardt algorithm for NuSTAR and Swift-XRT) with the same results obtained with gammapy with the default minuit/migrad as minimizer and algorithm. For simplicity, a classical power-law with absorption with amplitude defined as the photon density at a reference energy was used for Fermi-LAT and Swift-XRT (including also EBL absorption for Fermi-LAT following in this case Domínguez et al. (2011) as it is included in the Fermitools, and neutral hydrogen for Swift-XRT as implemented in xspec’s TBabs code). For NuSTAR, a power-law with integral as amplitude parameter was utilised as xspec does not allow us to change the default reference energy, which is fixed at 1 keV and therefore out of the energy range of the instrument. Switching to migrad inxspec showed a completely negligible impact on the estimated minima.
| Fermi-LAT (at 1 GeV) | NuSTAR A+B (3–70 keV) | Swift-XRT (at 1 keV) | |||||
|---|---|---|---|---|---|---|---|
| amplitude | index | integral flux | index | amplitude | index | ||
| native | 1.00 ± 0.23 | 2.01 ± 0.16 | 6.30 ± 0.12 | 1.633 ± 0.030 | 10.20 ± 0.60 | 1.683 ± 0.077 | |
| gammapy | 0.98 ± 0.23 | 2.05 ± 0.19 | 6.32 ± 0.12 | 1.630 ± 0.030 | 10.29 ± 0.60 | 1.690 ± 0.078 | |
| scale/units | X10−11 | MeV−1s−1 cm−2 | ×10−4 | s−1cm−2 | ×10−4 | keV−1 s−1cm−2 | |
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