IACHEC Cross-Calibration of Chandra, NuSTAR, Swift, Suzaku, and   XMM-Newton with 3C 273 and PKS 2155-304
  On behalf of the International Astronomical Consortium for High Energy Calibration (IACHEC), we present results from the cross-calibration campaigns in 2012 on 3C 273 and in 2013 on PKS 2155-304 between the then active X-ray observatories Chandra, NuSTAR, Suzaku, Swift and XMM-Newton. We compare measured fluxes between instrument pairs in two energy bands, 1-5 keV and 3-7 keV and calculate an average cross-normalization constant for each energy range. We review known cross-calibration features and provide a series of tables and figures to be used for evaluating cross-normalization constants obtained from other observations with the above mentioned observatories. 
Kristin K. Madsen, Andrew P. Beardmore, Karl Forster, Matteo   Guainazzi, Herman L. Marshall, Eric D. Miller, Kim L. Page, M...
astro-ph.IM