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Abell 3376 is a merging cluster of galaxies at redshift z=0.046, famousmostly for its giant radio arcs, and shows an elongated and highlysubstructured X-ray emission, but has not been analysed in detail at opticalwavelengths. We have obtained wide field images of Abell 3376 in the B band andderive the GLF applying a statistical subtraction of the background in threeregions: a circle of 0.29 deg radius (1.5 Mpc) encompassing the whole cluster,and two circles centered on each of the two brightest galaxies (BCG2,northeast, coinciding with the peak of X-ray emission, and BCG1, southwest) ofradii 0.15 deg (0.775 Mpc). We also compute the GLF in the zone around BCG1,which is covered by the WINGS survey in the B and V bands, by selecting clustermembers in the red sequence in a (B-V) versus V diagram. Finally, we discussthe dynamical characteristics of the cluster implied by a Serna & Gerbalanalysis. The GLFs are not well fit by a single Schechter function, butsatisfactory fits are obtained by summing a Gaussian and a Schechter function.The GLF computed by selecting galaxies in the red sequence in the regionsurrounding BCG1 can also be fit by a Gaussian plus a Schechter function. Anexcess of galaxies in the brightest bins is detected in the BCG1 and BCG2regions. The dynamical analysis based on the Serna & Gerbal method shows theexistence of a main structure of 82 galaxies which can be subdivided into twomain substructures of 25 and 6 galaxies. A smaller structure of 6 galaxies isalso detected. The B band GLFs of Abell 3376 are clearly perturbed, as alreadyfound in other merging clusters. The dynamical properties are consistent withthe existence of several substructures, in agreement with a previouslypublished X-ray analysis.

The merging cluster of galaxies Abell 3376: an optical view