  Scalar fields like dilaton appear in quantum field theory (QFT) due to scale
symmetry breaking. Their appeal also extends to modified theories of gravity,
like $F(R)$ gravity, Horva Lifshitz gravity etc. In unified theories they make
their appearance through compactification of the extra dimension. Apart from
resolving the issues of compactification scale and size, the particles of their
fields can also turn out to be excellent candidate to solve the dark energy
(DE) and dark matter (DM) problem of the universe. In this work we study their
mixing dynamics with photons in a magnetized media, by incorporating the effect
of parity violating part of the photon polarization tensor, evaluated in a
finite density magnetized media. This piece, though in general is odd in the
external magnetic field strength $eB$; in this work we however have retained
terms to $O$($eB$). We are able to demonstrate in this work that, in magnetized
medium a dilatonic scalar field $(\phi)$ can excite the two transverse degrees
of freedom (DOF) of the photons. One due to direct coupling and the other
indirectly through the parity violating term originating due to magnetized
medium effects. This results in the mixing dynamics being governed by, $3\times
3$ mixing matrices. This mixing results in making the underlying media
optically active. In this work we focus on the spectro-polarimetric imprints of
these particles, on the spectra of the electromagnetic (EM) fields of Gamma Ray
Bursters (GRB). Focusing on a range of parameters (i.e., magnetic field
strength, plasma frequency $(\omega_{p})$, size of the magnetized volume,
coupling strength to photons and their mass) we make an attempt to point out
how space-borne detectors should be designed to optimise their detection
possibility.
