  We present optical and NIR (near infrared) follow up observations of the GRB
001109 from 1 to 300 days after the burst. No transient emission was found at
these wavelengths within this GRB's (Gamma Ray Burst) 50" radius BeppoSAX error
box. Strong limits (3 sigma) are set with: R >~ 21, 10.2 hr after the GRB; I >~
23, 11.4 hr after the GRB; H >~ 20.7, 9.9 hr after the GRB; and Ks >~ 20, 9.6
hours after the GRB. We discuss whether the radio source found in the GRB's
error box (Taylor et al. 2000) might be related to the afterglow. We also
present a multiwavelength study of a reddened starburst galaxy, found
coincident with the potential radio and the X ray afterglow. We show that our
strong I band upper limit makes of the GRB 001109 the darkest one localised by
the BeppoSAX's NFI (Narrow Field Instrument), and it is one of the most
constraining upper limits on GRB afterglows to date. Further to it, the
implications of these observations in the context of dark GRBs are considered.
