XMM-Newton Science Analysis System


timeappend (timeappend-1.5) [xmmsas_20110223_1801-11.0.0]

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Algorithm

• Copy table referenced by parameter table to output dataset (specified by parameter outset)
• If withsettings is false, write dummy attributes CCDID, CCDNODE and (if instrument is EPN) QUADRANT, and set OAL state using the i/p event list. Otherwise, set the state according to the parameters instrument, datamode, node, and expnr.

• Access FRAME and CCDID columns of i/p table. If the instrument is EPN, access the QUADRANT column as well.

• Create a new table of the same name as the original in o/p dataset. Create a TIME column in new table.

• For each row of i/p table
  • Get the CCD number: in the case of the MOS/RGS, read the CCDID value. In the case of PN, combine the CCDID and QUADRANT values into a single CCD number.
  • Group the CCD number and FRAME info into a structure, and add this to a linked list.

• End row loop

• Sort CCD/FRAME linked list in order of CCD number.

• Group linked list in blocks of constant CCD number

• For each block of constant CCD number
  • Set OAL state for CCD Number
  • Call OAL to convert FRAME values in block into UTC TIME (Using the C++ equivalents of the F90 calls OAL_frameCounterToObt and OAL_obtToTimeTag)
• End block loop

• Write out linked list to TIME column.