Using the SDSS and Pan-STARRS1 survey data , we found a likely companion of the recently discovered binary \gamma -ray radio-loud millisecond pulsar J0621+2514 .
Its visual brightness is about 22 mag .
The broad band magnitudes and colours suggest that this is a white dwarf .
Comparing the data with various white dwarfs evolutionary tracks , we found that it likely belongs to a class of He-core white dwarfs with a temperature of about 10 000 K and a mass of \lesssim 0.5 M _ { \odot } .
For a thin hydrogen envelope of the white dwarf its cooling age is \lesssim 0.5 Gyr which is smaller than the pulsar characteristic age of 1.8 Gyr .
This may indicate that the pulsar age is overestimated .
Otherwise , this may be explained by the presence of a thick hydrogen envelope or a low metallicity of the white dwarf progenitor .