XMM-Newton Science Analysis System
epfast (epfast-0.7) [xmmsas_20211130_0941-20.0.0]
task is designed to correct for a CTI effect which
has been seen in EPIC-pn fast mode (timing, burst mode) data.
Firstly, it finds the count rate of electrons which have been recorded
at a given time in a given column of the CCD. It then applies a formula
to this rate to calculate a correction value for the CTI.
where Ein is the initial PI value of the event, Eout
is the final PI value and rate is the number of electrons per
second observed in a
particular column at a given time. The coefficients, a0, a1 and a2 have
been calibrated using in-orbit data and are different for Timing and Burst
The number of electrons is derived from the total PI charge deposited
on the column at that time.
XMM-Newton SOC -- 2021-11-30