CGS4 Latency

It has come to our knowledge that the 256 x 256 InSb array in CGS4 suffers from small scale  latent images. This problem has only become noticeable since long integrations have become possible due to the small pixel sizes in use with the long focal length camera.

In general, the latency only affects long exposures of very faint sources after previously observing a bright source (e.g., a standard star). The level of latency varies, but is usually less than about 5 counts (30 electrons) above the general background level.

The simplest method to rid the array of the latent image is to ask your TSS to run manpeak to take a few short exposures without changing the apperture, once you are pointing at your faint source.

If your targets are bright enough to peakup on, then the above procedure is unnecessary. The process of peaking up will remove any latent image.