In addition to the standard modes, CIRCE will be the only instrument at the GTC combining polarimetric capabilities with high speed read-out in the near-infrared range. The combination of these uniques modes with a photon collecting area of effective diameter 10.4m are important for present research fields inside and outside of our galaxy. In the last decades, polarimetry has become an important issue in the understanding of geometries, populations and magnetic fields. This technique has been applied in fields as microquasars, agn, stellar evolution and formation, outbursts, ... Because most of these phenomena are hiden in the visible imaging and spectra polarimetry in the infrared has become necessary. Presently, polarimetric observations in the IR are possible using IRCAL @ 3m Lick Observatory,IRPOL2. @ 3.8-m United Kingdom Infrared Telescope (UKIRT), IRCAM + IRPOL2 @ 3.8-m United Kingdom Infrared Telescope (UKIRT), NACO @ 8.2 m Unit Telescope (UT), Mimir @ 1.8 m Perkins telescope, SIRPOL @ 1.4 m telescope IRSF (InfraRed Survey Facility), ... These observations showed the importance of polarimetry in the infrared for elucidating several astrophysical mechanisms. However, their results are limited by the diameter of telescopes and the time resolution of the instruments. Some of these objects present high variability. These instruments are unable to time resolve these variations. The decision of combining these two modes came from the need in the scientific community of an polarimeter able to solve highly variable features. However most of these sources are weak and it was not possible to reach such time resolution with low photons. GTC has a 10.4m diameter collecting area giving the opportunity of making this observations a reality. We propose some subjects of study with CIRCE ...

FOTO
GALACTIC
Galactic Center
Galactic Magnetic Fields
Microquasars
Massive Stars
Gamma Ray Outbursts
Young Stars
Star and Planet Formation

EXTRAGALACTIC
AGN
Quasars
Early Universe