Status: To Do
Data Release Production
mfisherlevine reported during the Monday calibration products meeting that odd features were observed when the camera was allowed to sit idle. The attached images show two science images, 2023021400321 and 2023021400849 that have bright artifacts in amplifiers C13, C01, and C03. These are exactly the same kind of features I've seen previously during bias construction. I've attached are bias residual images (bias frame with only overscan and combined bias applied), 2022092700005 and 2022092700006 which show these features blink out when the time between exposures is short. A short summary table of dateobs values is below showing that the exposure prior to the one with the artifacts is generally more than an hour.
In browsing the RubinTV archive, I was able to find an example in which a smaller artifact is appearing with only ~five minutes of idle time, with 2023021400421 showing features that disappear in [422|https://roundtable.lsst.codes/rubintv-dev/summit/auxtel/monitor/event/2023-02-14/422]
For bias construction, I've started skipping the first exposure, and the current LATISS defect map masks these areas to attempt to mitigate their impact. However, knowing that it's very likely related to the idle time makes it a good example for the SITCom/ISR group.
youtsumi, any thoughts on what may be happening, and how they may be corrected?