MTA ACIS Rejected Events
The links below are plots of stat1 quantities, showing on-board rejected
events. The average EVTSENT,
DROP_AMP, DROP_POS, DROP_GRD, THR_PIX, and maximum BERR_SUM obtained from
L1 acis*stat1.fits files are plotted
for each observation. CTI observations are plotted separately from regular
science observations.
Column definitions:
- EVTSENT - number of events sent in data record
- DROP_AMP - number of discarded events due to corrected amplitude
- DROP_POS - number of discarded events due to CCD position
- DROP_GRD - number of discarded events due to grade code
- THR_PIX - number of pixels above respective threshold level
- BERR_SUM - number of pixel bias errors so far in science run
Notes:
-
The half-life decay of the CTI source is clearly evidenced in the steady
decline of EVTSENT.
-
The slope of the averaged dropped events and THR_PIX changes around DOM 380.
This may be a seasonal effect due to solar activity and changes in background
rates.
A full explanation and fit method are being determined.
Maintained by bspitzbart at cfa.harvard.edu
