The recent launch of Fermi / GLAST - coinciding with the MAXI workshop -
opens a new era for studies of jet-dominated active galaxies, known as blazars.
While the emission processes operating in various spectral bands in blazars are
reasonably well understood, the knowledge of the details of the structure of
the jet, location of the dissipation region with respect to the accreting black
hole, and coupling of the jet to the accretion process are known only at a
rudimentary level. Blazars are variable, and this provides an opportunity to
use the variability in various bands - and in particular, the relationship of
respective time series to each other - to explore the relative location of
regions responsible for emission in the respective bands. Observationally, this
requires well-sampled time series in as many spectral bands as possible. To
this end, with its all-sky, sensitive monitoring capability, the recently
launched GLAST, and MAXI, to be deployed in 2009, are the most promising
instruments bound to provide good sampling in respectively the energetic
gamma-ray, and the soft X-ray band. This paper highlights the inferences
regarding blazar jets that can be gleaned from such joint observations.Comment: Submitted to the proceedings of 3rd MAXI workshop "Astrophysics with
All-Sky X-ray Observations," 10-12 June 2008, RIKEN, Wako, Saitama, Japa