Tracking the Ulx Population Activity in the Circinus Galaxy during the Ixpe Observation

We propose two observations of the nuclear region of the Circinus Galaxy, 10 ks long each, simultaneous to the IXPE (Imaging X-ray Polarimeter Explorer) pointing of the source. We aim at monitoring the flux level of the two Ultra Luminous X-ray sources (ULXs) CG X-1 and CG X-2, which might potentially contaminate the measurement of the polarization signal from the Active Galactic Nucleus (AGN). With its superior angular resolution, Chandra is the only X-ray observatory on orbit which will allow us to disentangle the emission of CG X-1 and CG X-2 from the one of the AGN. Since CG X-1 varies on timescales of weeks, we require an ACIS-S observation at the beginning and another one at the end of the IXPE pointing (which is about 20 days long).