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We present multiwavelength (optical/near infrared/millimetre) observations ofa short duration gamma-ray burst detected by Swift (GRB 050509b) collectedbetween 0 seconds and ~18.8 days after the event. No optical, near infrared ormillimetre emission has been detected in spite of the well localised X-rayafterglow, confirming the elusiveness of the short duration events. We alsodiscuss the possibility of the burst being located in a cluster of galaxies atz= 0.225 or beyond. In the former case, the spectral energy distribution of theneighbouring, potential host galaxy, favours a system harbouring an evolveddominant stellar population (age ~360 Myr), unlike most long duration GRB hostgalaxies observed so far, i.e. thus giving support to a compact binary mergerorigin. Any underlying supernova that could be associated with this particularevent should have been at least 3 magnitudes fainter than the type Ib/c SN1998bw and 2.3 magnitudes fainter than a typical type Ia SN.Comment: Accepted for publication in A&A letter

GRB 050509b: the elusive optical/nIR/mm afterglow of a short-duration GRB