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INTEGRAL Cross-Calibration task

We have taken benefit of our common presence at the IACHEC meeting (mid
April) to discuss the cross-calibration procedure.
Participants: E. Jourdain, L. Natalucci, JP. Roques, NJ. Westergaard

Our conclusions:

- JEM-X and SPI teams can provide Crab spectra (one per revolution) from 
  now on.
- IBIS team has to wait  for the new calibration software and responses, 
  foreseen for mid-june (LN+Ph. Laurent information). If so, LN will re-do 
  the IBIS analysis within the following month.

A "put together" task will be then performed and some results should be
available and presented during (but outside) the CHIA workshop.

Aims: Simultaneous fit of JEM-X/IBIS/SPI data for each revolution
 (~ 20 rev from rev 43 to 1019).
Determination of cross normalisation factors (and evolution with time).
Behaviour of the residuals from one instrument to the other (idem)

In any case, a discussion on the status of the work will be planned at 
the Chia Laguna Workshop 2011.
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