SN 1987A : from the beginning at La Silla up to now with Spitzer & ALMA. 11722.308 days after its outburst

The explosion of SN 1987A in the LMC on February 23, 1987, generated a real outburst of the activities at La Silla. The scheduled and on-going observations were soon modified at all telescopes, for giving to this once-in-a-life-time event the importance it deserved. I will single out the exceptional temporal coverage of the observations conducted in the infrared, and their importance in understanding the physical phenomena that accompanied the evolution of the supernova. I will present the main results yield by the ESO group enlightening the building of the most complete and accurate bolometric light curve ever obtained from a supernova, the discovery of dust condensation in the ejecta, and the first estimates of chemical abundances. I would also especially draw attention to some of the advancements experienced during this adventure. Observations are continuing and I will present a summary of the up-to-date results. I will give an overview of the Guarantee Time Observations (GTO) that will be conducted with JWST.