NICER observation list: Target ID 550101

We propose 3 joint nicer+nustar ToOs observations of transient black hole X-ray binaries to be taken in coordination with IXPE, a NASA-ASI mission that will be launched on Dec,9,2021.The first year IXPE observing plan includes up to 3ToO of TBHXB in outburst.Each ToO includes one long exposure in the hard state and another in the soft(> 300ks). We propose(for each ToO) two 30ks nicer+nustar~exposures during the hard state IXPE pointing and one 20 ks nicer+nustar~exposure during the soft state IXPE pointing. This will provide an unprecedented combination of X-ray polarimetry, high resolution spectroscopy and timing; yielding unique information on coronal geometry, blackhole spin and role of the jets