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Multi-pulsed GRB 190530A, detected by the GBM and LAT onboard \fermi, is thesixth most fluent GBM burst detected so far. This paper presents the timing,spectral, and polarimetric analysis of the prompt emission observed using\AstroSat and \fermi to provide insight into the prompt emission radiationmechanisms. The time-integrated spectrum shows conclusive proof of two breaksdue to peak energy and a second lower energy break. Time-integrated (55.43$\pm$ 21.30 \%) as well as time-resolved polarization measurements, made by theCadmium Zinc Telluride Imager (CZTI) onboard \AstroSat, show a hint of highdegree of polarization. The presence of a hint of high degree of polarizationand the values of low energy spectral index ($\alpha_{\rm pt}$) do not run overthe synchrotron limit for the first two pulses, supporting the synchrotronorigin in an ordered magnetic field. However, during the third pulse,$\alpha_{\rm pt}$ exceeds the synchrotron line of death in few bins, and athermal signature along with the synchrotron component in the time-resolvedspectra is observed. Furthermore, we also report the earliest opticalobservations constraining afterglow polarization using the MASTER (P $<$ 1.3\%) and the redshift measurement ($z$= 0.9386) obtained with the 10.4m GTCtelescopes. The broadband afterglow can be described with a forward shock modelfor an ISM-like medium with a wide jet opening angle. We determine acircumburst density of $n_{0} \sim$ 7.41, kinetic energy $E_{\rm K} \sim$ 7.24$\times 10^{54}$ erg, and radiated $\gamma$-ray energy $E_{\rm \gamma, iso}\sim$ 6.05 $\times 10^{54}$ erg, respectively.

Probing into emission mechanisms of GRB 190530A using time-resolved spectra and polarization studies: Synchrotron Origin?