NICER observation list: Target ID 655701

We propose 3joint NICER+NuSTAR ToOs observations of TBHXBs to be taken in coordination with the IXPE, a NASA-ASI mission launched on 2021. The second year IXPE observing plan includes 3ToOs of TBHXB in outburst. Each ToO includes one long (300ks) exposure in the hard state and another in the soft state. In fact, until now IXPE has not had an opportunity to observe a TBHXB in outburst because of the lack of bright outbursts occurred within the visibility windows. We propose (for each ToO) two 30ks NICER+NuSTAR exposures during the hard state IXPE observation and one 20ks NICER+NuSTAR exposure during the soft state IXPE observation. This will provide, as demonstrated by the IXPE first year results, an unprecedented combination of X-ray polarimetry and high resolution broad-band spectroscopy