Continuum source catalog for the first APERTIF data release

The first data release of Apertif survey contains 3074 radio continuum images covering a thousand square degrees the sky. observations were performed during August 2019 to July 2020. produced at central frequency 1355 MHz with bandwidth $\sim$150 and angular resolution reaching 10". In this work we introduce apply new method obtain primary beam model using machine learning approach, Gaussian process regression. models obtained are published along products for release. We images, mosaic them extract source catalog. catalog 249672 sources many which detected time these frequencies. cross-match coordinates NVSS, LOFAR/DR1/value-added LOFAR/DR2 catalogs resulting in 44523, 22825 152824 common respectively. sample provides unique opportunity detect long term transient have significantly changed their flux density last 25 years. second third ones combined together provide information about spectral properties as well redshift estimates.