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We observe a system of filaments and clusters around Cl0016+1609 andMACSJ1621.4+3810 using the SITELLE Fourier transform spectrograph at the CanadaFrance Hawaii Telescope. For Cl0016+1609 (z=0.546), the observations span an11.8 Mpc x 4.3 Mpc region along an eastern filament which covers the maincluster core, as well as two 4.3 Mpc x 4.3 Mpc regions which each coversouthern subclumps. For MACSJ1621.4+3810 (z= 0.465), 3.9 Mpc x 3.9 Mpc aroundthe main cluster core is covered. We present the frequency and location of theemission line galaxies, their emission line images, and calculate the starformation rates, specific star formation rates and merger statistics. InCl0016+1609, we find thirteen [OII]~3727 Angstrom emitting galaxies with starformation rates between 0.2 and 14.0 M$_{\odot}$ yr$^{-1}$. 91$^{+3}_{-10}$%are found in regions with moderate local galaxy density, avoiding the densecluster cores. These galaxies follow the main filament of the superstructure,and are mostly blue and disky, with several showing close companions andmerging morphologies. In MACSJ1621.4+3810, we find ten emission line sources.All are blue (100$^{+0}_{-15}$%), with 40$^{+16}_{-12}$% classified as diskyand 60$^{+12}_{-16}$% as merging systems. Eight avoid the cluster core(80$^{+7}_{-17}$%), but two (20$^{+17}_{-7}$%) are found near high densityregions, including the brightest cluster galaxy (BCG). These observations pushthe spectroscopic study of galaxies in filaments beyond z~ 0.3 to z~ 0.5. Theirefficient confirmation is paramount to their usefulness as more galaxy surveyscome online.

Efficient detection of emission line galaxies in the Cl0016+1609 and MACSJ1621.4+3810 supercluster filaments using SITELLE