Date: Mon, 14 Oct 2002 11:27:13 -0400 (EDT)
Cc: bgaensler@cfa.harvard.edu (Bryan Gaensler)
From: Bryan Gaensler <bgaensler@cfa.harvard.edu>
Organisation: Harvard-Smithsonian Center for Astrophysics
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Dear Chandra users,
There has been some discussion on this list in the past about the
accuracy of positional determinations for point sources as a function
of off-axis angle.
Has anyone explored whether the difference between the true position of
a source and that given by WAVDETECT can be decomposed into two
components: a random error and a systematic offset? In other words, is
there a distortion map which can be applied to ACIS data, which
corrects for a systematic bias in the positions of sources as a
function of off-axis angle, energy and signal-to-noise? Or are the
errors in off-axis positions entirely random in nature?
regards,
Bryan Gaensler
------------------------------------------------------------------------
Dr. Belinda Wilkes Tel : (617) - 495 - 7268
Harvard/Smithsonian email: belinda@cfa.harvard.edu
Center for Astrophysics fax : (617) - 495 - 7356
60 Garden Street Assistant Director
Cambridge MA 02138 Chandra X-ray Center (CXC)
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