BeppoSAX Data Archive :
Coordinates Correction
A ~20 arc sec systematic error that affects LECS and MECS coordinates has been
identified and a detailed discussion is given in the technical report
"An improvement of BeppoSAX LECS and MECS source positioning accuracy"
(HTML
or
PS version).
A brief discussion of the problem and the solution is available also
on the web
The BeppoSAX data delivered by the ASDC-BeppoSAX at the HEASARC archive
do not have this correction applied.
All LECS and MECS event files retrieved from the
ASDC archive , after March 12 2002, have this correction already applied.
The BeppoSAX-ASDC provided a script "saxposcor" that applies the correction
to the LECS and MECS event files and updates the WCS keywords.
The "saxposcor" should be applied to all LECS and MECS event files
retrieved from the HEASARC archive and processed before March 12 2002.
The processing date is stored in the keyword header DATE of the fits file
(use the FTOOLS fkeyprint as 'fkeyprint filename DATE').
saxposcor is a tcl script. It needs the FTOOLS package to run and corrects any
BeppoSAX-NFI event file (LECS, MECS1, MECS2, MECS3, MECS23 and MECS), e.g.
it does not work on the images.
To use saxposcor retrieve the following two files:
saxposcor
saxposcor.par
The usage of saxposcor is the following:
saxposcor filename=MECS2_00000000.evt indir=path
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