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A series of experiments has been performed to measure the dependence on the fragment mass and total kinetic energy of the average number and energy of prompt neutrons emitted from 235 U and 239 Pu fission fragments in thermal neutron induced fission. The experiments were carried out using neutrons from the PNPI WWR-M research reactor in Gatchina. For the 239 Pu target the fragment -neutron correlation measurement was also performed at the first resonance. In this case the neutron energy of the strong resonance at 0.296 eV was selected by a Sm filter which was arranged in the neutron flux from the reactor. The description of the experimental set-up and some preliminary results of the average number and kinetic energies of prompt neutrons as a function fragment mass are presented in this article.

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