Bugs: acis_find_afterglow

Caveats
Bugs fixed in CIAO 4.5

Caveats

On the rare occasions that there are two hot pixels adjacent to one another, the tool may not identify one of the hot pixels. (06 Feb 2012)

Bugs fixed in CIAO 4.5

The following is a list of bugs that were fixed in the CIAO 4.5 software release.

If the event data have invalid exposure numbers, then the afterglows will have TIME=NaN. (21 Dec 2011)

If the input event data have invalid exposure numbers (EXPNO<3), then the resulting afterglows will have TIME=NaN. These exposure numbers occur in observations affected by the threshold-plane (T-plane) latchup issue, which is noted in the comments section of the V&V report.

Workaround:

Filter the event data before running the afterglow tool. The valid ranges are EXPNO>=3 for timed mode data and EXPNO>=4 for continuous-clocking mode.

unix% dmkeypar acisf00659_000N003_evt1.fits READMODE echo+
TIMED

unix% dmstat "acisf00659_000N003_evt1.fits[cols EXPNO]"
expno
    min:        2             @:        1 
    max:        3073          @:        754068 
   mean:        1478.2589949 
    sum:        1114783195 
   good:        754119 
   null:        0 

unix% dmcopy "acisf00659_000N003_evt1.fits[EXPNO>2]" acisf00659_expno_evt1.fits