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In this work we analyse 3 average-luminosity hard X-ray selected AGN: ESO506-G27, IGR J19039+3344 and NGC 7465. They have simultaneous Swift/XRT andNuSTAR data never published before and have been poorly studied at X-rayenergies. These sources make for interesting targets both from a methodologicaland scientific point of view. Scientifically, they are of interest since theyare possibly heavily absorbed objects, belong to a peculiar class and arevariable both in flux and in spectral shape. Methodologically, because it is aninteresting exercise to understand how existing spectral models can be appliedto faint sources and how the use of NuSTAR data alone and then simultaneousand/or average data impacts on the spectral parameters determination. In thiswork we demonstrate that simultaneous data are not sufficient if theirstatistical quality is poor. Moreover, we show that also the use oftime-averaged data when dealing with faint AGN does not always provideconfident results as for brighter AGN. Regardless of the poor data qualityemployed in our analysis, we are able to provide insights into the spectralcharacteristics of each source. We analyse in detail for the first time theiron line complex of ESO 506-G27, finding not only the presence of the ironK$\alpha$ and K$\beta$ lines, but also of the iron K edge around 7 keV in theNuSTAR data. We also highlight changes in the absorption properties of IGRJ19039+3344 and confirm NGC 7465 to be an unabsorbed type 1 LINER.

Dealing with broad-band X-ray spectra of faint AGN: a case study