  Open clusters are excellent tools to probe the history of the Galactic disk
and properties of star formation. In this work, we present a study of an old
age open cluster Berkley 39 using the observations from UVOT instrument of the
Neil Gehrels Swift observatory. Making use of a machine learning algorithm,
ML-MOC, we have identified a total of 861 stars as cluster members out of which
17 are blue straggler stars. In this work, we present a characterisation of 2
blue straggler stars. To estimate the fundamental parameters of blue straggler
stars and their companions (if any), we constructed spectral energy
distributions using UV data from swift/UVOT and GALEX, optical data from Gaia
DR3, and infrared (IR) data from 2MASS, Spitzer/IRAC, and WISE. We find excess
flux in UV in one blue straggler star, implying the possibility of a hot
companion.
