These programs, of which Gaia is an emblematic example, often require rapid reactions that can be accessed by amateur telescopes. Targets range from new solar system objects to Supernovae or Gamma Ray Bursts, via Novae or eruptive stars, for example. This involves various techniques : astrometry, photometry and spectroscopy. This activity involves the organization of workshops, the first of which was held in October 2022. It is coordinated by W. Thuillot (IMCCE), Th. Midavaine (SAF), M. Dennefeld (IAP), Ch. Buil (ARAS).
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