NICER observation list: Target ID 470003

The Event Horizon Telescope (EHT) is effectively an Earth-sized, interferometric mm-band array with 20 uas spatial resolution that is conducting ground-breaking observations of supermassive black hole systems. The mm emission region sizes resolved by EHT are consistent with those inferred from X-ray and gamma-ray variability studies. We propose NuSTAR (in conjunction with XMM and/or NICER) observations of up to 6 blazars during the Spring 2021 EHT campaign. The chosen systems are those targeted by EHT, in prime mission or calibration, for studying blazar jet launching. Our X-ray observations will provide exceptional quality spectra and timing capabilities in the 0.1 70 keV band. All of the selected targets have shown both long term and short term flaring variability.