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XMM-Newton Science Analysis System Page: 1
evalcorr
July 8, 2007
Abstract
Evaluate the output of eposcorr
1 Instruments/Modes
Instrument Mode
EPIC Imaging
2 Use
pipeline processing yes
interactive analysis no
3 Description
The task performs one or more of several tests to evaluate the position correction as performed by
eposcorr. These tests lead to a boolean value POSCOROK. These are two test, 1XMM and 2XMM.
Both rely on values written to the header of the source list by eposcorr. New attributes POSCOROK
and SYSERRCC are written to the output as keywords. Options also exist to write additional attributes
indicating the result of each test and intermediate values.
evalcorr performs a simple evaluation of eposcorr amended source lists. If the correlation is determined
to be bad then the RA, DEC , LII and BII columns are used to overwrite the RA CORR , DEC CORR
, LII CORR and BII CORR columns respectively.
The 1XMM evaluation is:
POSCOROK = ((
p
RAOFFSET 2 +DEOFFSET 2 ) <= radiusthresholdANDLIK HOOD > likhoodthreshold)
The 2XMM evaluation is:
POSCOROK = (LIKHOOD > intercept + gradient  LIKNULL)
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4 Parameters
This section documents the parameters recognized by this task (if any).
Parameter Mand Type Default Constraints
input yes set
Input data set. The default table is SRCLIST although an alternative may be specied.
mode no string clone
Modify the input le or clone to output before making changes.
output no set
Output data set. The output tablename will be the same as input tablename.
radiusthreshold no real 6.0
Radius threshold for 1XMM test.
likhoodthreshold no real 5.0
Likelyhood threshold for 1XMM test.
gradient no real 2.0
Gradiant for 2XMM test.
intercept no real 5.0
Y intercept in 2XMM test.
setsyserrcc no bool yes
Record the SYSERRCC attribute.
corrsyserrcc no real 0.5
Value of SYSERRCC when correlated.
uncorrsyserrcc no real 1.5
Value of SYSERRCC when uncorrelated.
setlikhdcmp no bool no
Record the intermediate value LIKHDCMP calculated for the 2XMM test.
recordresult no bool no
Record the results of individual tests as attributes.
5 Errors
This section documents warnings and errors generated by this task (if any). Note that warnings and
errors can also be generated in the SAS infrastructure libraries, in which case they would not be docu-
mented here. Refer to the index of all errors and warnings available in the HTML version of the SAS
documentation.
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InputIdenticaltoOutput (error)
The input and output les are the same le. Use the 'amendinput' if you really want to
amend the input source list.
OutputDatasetMissing (error)
The output dataset name has not been supplied when mode=CLONE.
VitalColumnMissing (error)
One of the columns such as RA or DEC does not exist and as such cannot be copied to the
corresponding CORR column.
MissingValue (error)
An attribute needed for a test is absent from the input.
6 Input Files
1. PPS product: source list after processing by eposcorr.
7 Output Files
1. PPS product: For mode=CLONE, a clone of the input source list with appropriate keywords
and column modications.
8 Algorithm
9 Comments
References
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