20 years of INTEGRAL /OMC optical monitoring of high energy sources

OMC, the Optical Monitoring Camera onboard INTEGRAL, has been monitoring the optical emission of hundreds of high energy sources during the last 20 years OMC performs optical V Johnson observations with exposure times of 10 50 and 200 seconds, simultaneously to the high energy observations obtained by the other instruments on INTEGRAL ( SPI and JEM X), downloading in addition the photometric data for around 100 objects within its 5 º ×5 º field of view In this contribution we review some representative results derived from the analysis of simultaneous optical and high energy observations using OMC data, including AGN, X ray binaries, cataclysmic variables, and even supernova explosions At the end of the INTEGRAL mission, we will compile and publish the final INTEGRAL/OMC catalogue, containing the complete ready to use light curves and variability analysis of all the sources monitored by OMC during its lifetime.