CCD calibration performed in 2007 - 2008

(27-Jul-2017 prepared by Aki Takeda : used for the discussion with Sakao-san in preparation for the 2017 calibration.)

The previous CCD calibration was performed in 2007 to 2008.

The following two XOBs were used.

Results from the previous calibration.

Dark current variation with CCD temperature. (Solid black line: data obtained before launch. Blue points : data obtained during normal observation mode. Red points : data obtained during CCD bakeout.) From a poster presentation (Bando, Kano, et al., 2008) in a Japanese meeting.

Considerations.

The problem with the 2017 calibration is that the G-band VLS=close images are significantly affected by the stray light since 14-Jun-2015. The above XOBs should be modified.

[click image to enlarge]