NICER observation list: Target ID 570401

4U 0142+61 is a magnetar that shows an infrared excess over the extrapolated optical SED, possibly due to a dusty fall-back disk formed in the aftermath of the supernova explosion. This excess will be probed by an accepted JWST Cycle 1 GO program. Here we propose joint NuSTAR+NICER observations simultaneous (or quasi-simultaneous) with the JWST observations to capture the broad band (IR/optical/hard and soft X-ray) spectrum. We will perform timing analysis to compare the pulse profiles in the IR/optical and X-ray observations and look for correlated variability among the broad band light curves. These observations will allow us to study the possible connection between the X-ray and IR/optical emission and understand whether or not the disk is reprocessing X-ray emission from the magnetar.