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We report on the redshift of the BL Lac object 3FGL J0909.0+2310 based onobservations obtained with the OSIRIS Multi Object Spectrograph (MOS) mountedon the 10.4-m Gran Telescopio Canarias. A redshift of 0.432+/-0.002 wasobtained by the identification of three absorption features (CaII K&H andG-band) detected in the spectrum of the BL Lac host galaxy. The closest objectto the BL Lac at an angular separation of 3.8" (~21 kpc at this distance) has asimilar redshift of 0.431+/-0.002. This companion galaxy could be the mostlikely cause of the nuclear activity as postulated by studies based on moreextended data sets and cosmological models. MOS allows us to study the object'sneighbourhood within a field of view of approximately 7'x2' and we find twosmall groups of galaxies at redshifts 0.28 and 0.39 which are probably notrelated to the activity of 3FGL~J0909.0+2310.

On the Redshifts of the BL Lac 3FGL J0909.0+2310 and its Close Companion