We report on the polarization measure , obtained with IBIS on board INTEGRAL of the prompt emission of GRB 061122 .
Over an 8 s interval containing the brightest part of the Gamma-Ray Burst we put a lower limit on its polarization fraction of 60 % at 68 % c.l .
and of 33 % at 90 % c.l .
on the 250–800 keV energy range .

We performed late time optical and near infra-red imaging observations of the GRB field using the Telescopio Nazionale Galileo ( TNG ) , and the Canada-France-Hawaii Telescope ( CFHT ) .
Our multi-band ( ugrizYJHK ) photometry allowed us to identify the host galaxy of GRB 061122 and to build its SED .
Using a photometric redshift code we fitted these data , and derived the basic properties of the galaxy , including its type and redshift , that we could constrain to the interval [ 0.57 , 2.10 ] at a 90 % c.l. , with a best fit value of z =1.33 .

The polarization measurement in different energy bands , together with the distance determination , allowed us to put the most stringent limit ( \xi \lesssim 3.4 \times 10 ^ { -16 } ) to date to a possible Lorentz Invariance Violation based on the vacuum birefringence effect , predicted by some quantum-gravity theories .