We report on the identification of a new soft gamma-ray source , namely IGR J20159+3713/SWIFT J2015.9+3715 , first detected by INTEGRAL /IBIS and then confirmed by Swift /BAT .
The source , which has an observed 20–100 keV flux in the range ( 0.7 - 1.4 ) \times 10 ^ { -11 } erg cm ^ { -2 } s ^ { -1 } , encloses a Fermi variable source ( 2FGL J2015.6+3709 ) and is spatially close to a TeV emitter ( VER J2016+372 ) .
Thanks to X-ray follow-up observations performed with the X-ray telescope on board Swift , we have been able to identify the new IBIS/BAT detection with the combined emission of the blazar B2013+370 and the cataclysmic variable RX J2015.6+3711 .
Both objects show variability in X-rays , with the CV being the most variable of the two .
At high energies ( above 20 keV ) the emission is likely dominated by B2013+370 , but the contribution from RX J2015.6+3711 is not negligible .
The blazar emits up to GeV frequencies where it is seen by Fermi , while the cataclysmic variable has a bremsstrahlung temperature which is too low to provide any contribution at these high energies .
These findings also indicate that the INTEGRAL / Swift source is not associated with the TeV emission , which is most likely due to the supernova remnant ( SNR ) /pulsar wind nebula ( PWN ) CTB 87 .