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We present the largest and deepest late-time radio and millimeter survey todate of superluminous supernovae (SLSNe) and long duration gamma-ray bursts(LGRBs) to search for associated non-thermal synchrotron emission. Using theKarl G. Jansky Very Large Array (VLA) and the Atacama LargeMillimeter/submillimeter Array (ALMA), we observed 43 sources at 6 and 100 GHzon a timescale of $\sim 1 - 19$ yr post-explosion. We do not detect radio/mmemission from any of the sources, with the exception of a 6 GHz detection ofPTF10hgi (Eftekhari et al. 2019), as well as the detection of 6 GHz emissionnear the location of the SLSN PTF12dam, which we associate with its hostgalaxy. We use our data to place constraints on central engine emission due tomagnetar wind nebulae and off-axis relativistic jets. We also explorenon-relativistic emission from the SN ejecta, and place constraints on obscuredstar formation in the host galaxies. In addition, we conduct a search for fastradio bursts (FRBs) from some of the sources using VLA Phased-Arrayobservations; no FRBs are detected to a limit of $16$ mJy ($7\sigma$; 10 msduration) in about 40 min on source per event. A comparison to theoreticalmodels suggests that continued radio monitoring may lead to detections ofpersistent radio emission on timescales of $\gtrsim {\rm decade}$.

astrophysical journal/the astrophysical journal

Late-Time Radio and Millimeter Observations of Superluminous Supernovae  and Long Gamma Ray Bursts: Implications for Obscured Star Formation, Central  Engines, and Fast Radio Bursts