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New SIS matrices for AO-2 simulations
There is now a new set of SIS response matrices for ascertaining the
feasibility of ASCA AO-2 proposals. They have been created from the
in-flight calibrations and are the best available as of 20 December 93.
The matrices can be obtained via anonymous FTP at:
in the directory
Please bear in mind the following points:
o Since these matrices are just for simulations, only one combination
of SIS and chip is given, namely SIS0-chip1.
o The matrices have 512 channels and are in FITS format.
o The four matrices correspond to four different positions on the chip:
s0c1_1ccd.rsp ..... default pointing position in 1-CCD mode
s0c1_2ccd.rsp ..... default pointing position in 2-CCD mode
s0c1_4ccd.rsp ..... default pointing position in 4-CCD mode
s0c1_center.rsp ... center of chip
They differ from one another in their vignetting. Roughly, the 4-CCD,
2-CCD, 1-CCD and center positions are 4, 5, 7 & 7 arcmin off axis,
o If it's not too late, please do your AO-2 simulations with these new
matrices. However, proposers will not be penalized if they use the
old, AO-1 matrix: the main difference between the old and the new is
that the new ones have a bit less effective area - not enough in most
cases to affect feasibility.
o AS FOR AO-1, PLEASE REMEMBER TO DOUBLE THE INTEGRATION TIMES IN YOUR
SIMULATIONS TO ACCOUNT FOR THE FACT THAT THERE ARE TWO SIS CAMERAS.
For example, to simulate a 30 ks observation, you should integrate with
these matrices for 60 ks.
Charles Day, ASCA GOF