Robotic Monitoring of Gravitationally Lensed Quasars

Table 2

Performance of the LRT when taking modest nightly exposures of double QSOs with images A and B.

Target/filter	Sampling period (days)	𝜎(𝑚A) (mmag)	𝜀A (%)	𝜎(𝑚B) (mmag)	𝜀B (%)
SBS 0909+532/𝑟	4	14	1.3	18	1.7
QSO 0957+561/𝑔	3.7	16	1.5	16	1.5
QSO 0957+561/𝑟	4.3	12	1.1	12	1.1
FBQ 0951+2635/𝑖	5-6	14	1.3	—	—