We analyze all publicly available long-term optical observations of the gravitationally lensed quasar PG1115+080 for the purpose of estimating time delays between its four components .
In particular , the light curves of PG1115+080 components obtained in 2001-2006 at Maidanak observatory ( Uzbekistan ) ( ( 60 ) ) are considered .
We find that the linear trend is observed in 2006 in light curves of all four components with fast variations only in the A1 and C components that can be due to microlensing and observational errors .
Application of the MCCF method ( ( 36 ) ) to the photometric data obtained in 2004-2005 gives values of time delays \tau _ { BC } = 22 ^ { +2 } _ { -3 } , \tau _ { AC } = 12 ^ { +2 } _ { -1 } and \tau _ { BA } = 10 ^ { +2 } _ { -3 } days , which are in agreement with the results received earlier by Schechter ( ( 48 ) ) and Barkana ( ( 2 ) ) for 1995-1996 light curves with two different methods of statistic analysis .
However , our estimates of \tau _ { BA } and \tau _ { BC } differ from the values received by the group of Vakulik based on the same Maidanak data ( ( 61 ) ) .
The ratio \tau _ { AC } / \tau _ { BA } is equal to \sim 1.2 that is close to the value , received by Barkana ( \sim 1.13 ) and predicted by lens models ( \sim 1.4 ) , unlike the values received by Schechter ( \sim 0.7 ) and Vakulik ( \sim 2.7 ) .