Transients

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CMB-S4 will regularly survey a large fraction of the sky with high sensitivity. This pattern of repeated observations of a single (or few) patches opens the possibility of doing a high-quality time-domain survey of emissive objects. The millimeter band, for reasons of field of view and observing priorities on non-CMB-focused instruments, has had almost no such survey conducted (SPTpol has done one; there have been no others), with the result that we know extremely little about the time-domain sky in these wavelengths (and it is a broad desert -- there are essentially no surveys between optical and 1 GHz radio, and the 1 GHz surveys are currently not that sensitive). At the same time, our observing band is one of significant scientific interest for understanding a wide variety of physics: Where mm observations have been used for follow-up of extragalactic transients or variable sources, they have greatly increased our understanding, in particular of GRBs.

GRBs

Science Goals

Survey Considerations

AGN

Science Goals

Survey Considerations

Other Possibilities

FRBs