NICER observation list: Target ID 772101

A few blackhole X-ray binaries (BHXRBs) show recurrent intensity dips in their light curves during outburst. These systems also always show indication of disk winds. The dips are believed to be caused by clumps of obscuring material passing along the line of sight to the X-ray source. Our knowledge of the origin of such obscurer, its composition and any relation with disk winds as well as spectral state is limited. Because soft X-ray photons are mostly absorbed by the obscuring material, NuSTAR's high energy capabilities make it the instrument of choice to study the nature of dips and obscuration in BHXRBs. NICER s high S/N also allows to probe the evolution of these features. We Therefore propose target of Opportunity observations with NuSTAR jointly with NICER to study these features.