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Up: CGS4Handbook 

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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 take a few exposures in movie mode while slewing from your bright source to your faint target. The number and integration time of the exposures has not been determined fully, but running movie for about 30 seconds, using one second exposures, should be sufficient. If you do not know how to run in movie mode, please check with your support scientist or TSS.

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.