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The unusual broad-band X-ray spectral variability of NGC 1313 X-1 seen with <i>XMM–Newton, Chandra</i>, and <i>NuSTAR</i>
We present results from the major coordinated X-ray observing program on the ULX NGC 1313 X-1 performed in 2017, combining $XMM$-$Newton$, $Chandra$ and $NuSTAR$, focusing on the evolution of the broadband ($\sim$0.3-30.0 keV) continuum emission. Clear and unusual spectral variability is observed, but this is markedly suppressed above $\sim$10-15 keV, …