NICER observation list: Target ID 771801

We request 180 ks NuSTAR observations of GX 1+4 (20 ks per month over 9 months) with 2 ks simultaneous NICER data to unravel long-term X-ray variability in this unique neutron star hosting symbiotic X-ray binary, GX 1+4. The X-ray variability is hypothesized to be caused by onset of two accretion modes: quasi-spherical (small flares) and free-fall (large flares). Increased absorption during dips suggests clumps, while low luminosity phases hint at the propeller regime. Previous NICER/Chandra monitoring could not constrain the source's spin period. NuSTAR's large photon collecting area over broadband energies is vital for interpreting the physics of this enigmatic source that has puzzled the X-ray binary community since discovery.