| Abstract: | In 2021 the symbiotic recurrent nova RS Ophiuchi had its last outburst, attributed to a thermonuclear runaway, observed at all wavelengths, from gamma-rays detected with Cherenkov telescopes at energy of a few hundred GeVs, to radio. For the first time, gamma-rays were measured for as long as almost three weeks while copious X-rays, the energy range in which the initial shock should produce emission, were measured simultaneously during all this period of time. In previous nova outburst, at the same time of the gamma-ray emission the X-ray flux was only marginally detected or not at all, so the idea was proposed that the shock is embedded in a very dense medium. I will illustrate how the RS Oph monitoring has demonstrated a very complex scenario and what can be learned from the amazing dataset gathered during that outburst
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