XMM-Newton Science Analysis System
eposcorr (eposcorr-3.13) [xmmsas_20211130_0941-20.0.0]
From version 1.1 on the output routine tests if the columns
RA_CORR and DEC_CORR are already present in the input/output file.
Depending on the presence of these columns it will either add them or
After the task has been run the following items will be present:
- X-ray source list with two additional columns, being the corrected RA and DEC called RA_CORR and DEC_CORR.
- The following keywords are added to the table:
RAOFFSET, DEOFFSET, which indicate the offsets in RA and DEC used to
correct the positions; RAOFFERR, DEOFFERR (the associated
statistical errors) and LIK_HOOD
(containing the likelihood statistic) and NMATCHES.
The keywords ROT_CORR
(rotational correction) and ROT_ERR (error in rotation) are also added.
The keyword LIK_NULL contains the likelihood that can be expected
from spurious matches only. It depends on the number of X-ray sources,
the distribution of their positional errors, and the surface density of optical sources.
- An optional image will be produced containing a map of likelihood values.
This image can be used to check the uniqueness of the optimization routine.
XMM-Newton SOC -- 2021-11-30