High-temporal resolution optical observations of the gamma-ray blazar PG1553+113

ANDRUCHOW, I.; COMBI, J. A.; CELLONE, S. A.,; MUÑOZ-ARJONILLA, A. J.; ROMERO, G. E.; MARTÍ, J.

Ciudad Autónoma de Buenos Aires

Simposio; IAU Symposium No. 275: "Jets at All Scales"; 2010

We present here the results of an observational photo-polarimetry campaign at optical wavelengths of the blazar PG 1553+113, which was recently detected at very high energies (> 100$GeV) by the H.E.S.S and MAGIC gamma-ray experiments. Our high-temporal resolution data show significant variations in the linear polarization percentage and position angle at inter-night time-scales, while at shorter (intra-night) time-scales both parameters varied less significantly, if at all. Simultaneous differential photometry (at the B and R bands) shows no significant variability in the total optical flux.