Anomalies of HSC's CCDs

Last update: November 2021


Major issues

DET-ID SDO-ID Channel Period (UT) Case Details
009 1_47 ch1 – 4 2014/04/03 – 2018/01/18 Saturation/anomaly patterns Link
033 0_20 ch1 – 4 2013/10/29 – Saturation/anomaly patterns Link
094 0_43 ch2 2014/03/25 – Poor linearity Link
000 1_53 ch3 2014/06/24 – No sensitivity Link
043 1_09 ch4 2015/11/06 – Light emission Link

Minor issues

DET-ID SDO-ID Channel Period (UT) Case Details
006 1_44 ch4 2014/03/25 – A bright spot Link
010 1_36 ch3 2014/03/25 – A bright spot Link
041 0_16 ch1 2021/10/01 – 2021/10/02 Light emission Link
050 1_12 ch2
ch3
2019/05/28 –
2014/03/25 –
Light emission
A bright spot
Link
062 0_07 ch4 2021/01/09 – 2021/01/18 Light emission Link
074 1_24 ch2 2014/06/30 – Light emission Link
090 0_47 ch2 2021/06/10 Light emission Link
100 0_31 ch1,2 2020/10/20 – 2020/10/23 Light emission/shadow Link





Major issues



DET-ID = 009 (SDO-ID = 1_47)


Channel Frame ID Period (UT) Case
ch1 HSCA00183747 – HSCA13846347 2014/04/03 – 2018/01/18 Saturation
ch2 HSCA00343747 – HSCA13846347 2014/06/30 – 2018/01/18 Saturation
ch3,4 HSCA10897547 – HSCA13846347 2017/04/02 – 2018/01/18 Anomaly patterns due to crosstalk

Note: Readout for this CCD has been suspended since 2018-02-08 UT.



Bias frames (raw)



DET-ID = 033 (SDO-ID = 0_20)


Channel Frame ID Period (UT) Case
ch1,2 HSCA26183220 – HSCA26504220 2021/08/31 – 2021/09/08 Anomaly pattern
ch3 HSCA09224620 – HSCA11034620
HSCA11034820 – latest
2016/12/23 – 2017/04/04
2017/04/20 –
Anomaly pattern → saturation
Saturation
ch4 HSCA00013620 – HSCA08943820
HSCA08945620 – latest
2013/10/29 – 2016/10/07
2016/11/22 –
Light emission from the channel corner
Saturation/blank



Bias frames (raw)



DET-ID = 094 (SDO-ID = 0_43)


Channel Frame ID Period (UT) Case
ch2 HSCA00021243 – latest 2014/03/25 – Poor linearity


Flat-fielded image

Dome flats with low illuminance



DET-ID = 000 (SDO-ID = 1_53)


Channel Frame ID Period (UT) Case
ch3 HSCA00226153 – latest 2014/06/24 – High bias level and no sensitivity


Raw images



DET-ID = 043 (SDO-ID = 1_09)


Channel Frame ID Period (UT) Case
ch4 HSCA04442709 – HSCA05383109
HSCA05383309 – latest
2015/11/06 – 2016/02/03
2016/02/03 –
Strong light emission from the channel corner
Weak light emission from the channel corners


Dark frames (overscan subtracted)




Minor issues



DET-ID = 006 (SDO-ID = 1_44)


Channel Frame ID Period (UT) Case
ch4 HSCA00021344 – 2014/03/25 – A bright spot


Dome flat frame (overscan subtracted)



DET-ID = 010 (SDO-ID = 1_36)


Channel Frame ID Period (UT) Case
ch3 HSCA00021336 – 2014/03/25 – A bright spot


Dome flat frame (overscan subtracted)



DET-ID = 041 (SDO-ID = 0_16)


Channel Frame ID Period (UT) Case
ch1 HSCA26505616 – HSCA26522816 2021/10/01 – 2021/10/02 Weak light emission from the edge


Dark frame (overscan subtracted)



DET-ID = 050 (SDO-ID = 1_12)


Channel Frame ID Period (UT) Case
ch2 HSCA17875112 – latest 2019/05/28 – Light emission from the edge
ch3 HSCA00021312 – 2014/03/25 – A bright spot


Dark frame (overscan subtracted)



Dome flat frame (overscan subtracted)



DET-ID = 062 (SDO-ID = 0_07)


Channel Frame ID Period (UT) Case
ch4 HSCA24489407 – HSCA24838207 2021/01/09 – 2021/01/18 Temporal light emission from the edge


Dark frame (overscan subtracted)



DET-ID = 074 (SDO-ID = 1_24)


Channel Frame ID Period (UT) Case
ch2 HSCA00343724 – latest 2014/06/30 – Light emission from the edge

Dark frame (overscan subtracted)



DET-ID = 090 (SDO-ID = 0_47)


Channel Frame ID Period (UT) Case
ch2 HSCA25570847 – HSCA25582447 2021/06/10 Temporal light emission from the edge


Dark frame (overscan subtracted)



DET-ID = 100 (SDO-ID = 0_31)


Channel Frame ID Period (UT) Case
ch2 HSCA23207631, HSCA23208831, HSCA23209031 2020/10/20 – 2020/10/21 Temporal light emission from the edge
ch1,2 HSCA23191231 – HSCA23325231 2020/10/20 – 2020/10/23 Shadow?


Dark (left) and Object (right) frames (overscan subtracted)





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