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We present the results of flux density, spectral index, and polarizationintra-night monitoring studies of a sample of eight optically bright blazars,carried out by employing several small to moderate aperture (0.4\,m to 1.5\,mdiameter) telescopes fitted with CCDs and polarimeters located in Europe,India, and Japan. The duty cycle of flux variability for the targets is foundto be $\sim 45$ percent, similar to that reported in earlier studies. Thecomputed two-point spectral indices are found to be between 0.65 to 1.87 forour sample, comprised of low- and intermediate frequency peaked blazars, withone exception; they are also found to be statistically variable for about halfthe instances where `confirmed' variability is detected in flux density. In theanalysis of the spectral evolution of the targets on hourly timescale, acounter-clockwise loop (soft-lagging) is noted in the flux-spectral index planeon two occasions, and in one case a clear spectral flattening with thedecreasing flux is observed. In our data set, we also observe a variety offlux-polarization degree variability patterns, including instances with arelatively straightforward anti-correlation, correlation, or counter-clockwiselooping. These changes are typically reflected in the flux-polarization angleplane: the anti-correlation between the flux and polarization degree isaccompanied by an anti-correlation between the polarization angle and flux,while the counter-clockwise flux-PD looping behaviour is accompanied by aclockwise looping in the flux-polarization angle representation. We discuss ourfindings in the framework of the internal shock scenario for blazar sources.

Multiband optical flux density and polarization microvariability study of optically bright blazars