1820012

Two years ago we initiated a multi-year program (AO-16 and AO-17) aimed at creation of an ultra-deep extragalactic field in the direction centered on galaxy M81. We now request new INTEGRAL observations in order to continue our program. This ultra-deep field will become INTEGRALs legacy for studies of the AGN population at hard X-ray fluxes as low as fewx10^-12 erg s^-1 cm^-2 and shall provide a ground for unique synergy of INTEGRAL with the all-sky X-ray surveys by the eROSITA and ART-XC telescopes on board the SRG observatory which began in December 2019. We ask for additional 5 Ms of INTEGRAL observations 2.5 Ms in AO18 (2021) and 2.5 Ms in AO19 (2022) to reach a sensitivity of 2x10^-12 erg cm^-2 s^-1 in the 17-60 keV energy band by the midtime of the SRG 4-year all-sky survey. [truncated! Please see actual data for full text]