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We present optical and NIR (near infrared) follow up observations of the GRB001109 from 1 to 300 days after the burst. No transient emission was found atthese wavelengths within this GRB's (Gamma Ray Burst) 50" radius BeppoSAX errorbox. 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, 9.6hours after the GRB. We discuss whether the radio source found in the GRB'serror box (Taylor et al. 2000) might be related to the afterglow. We alsopresent a multiwavelength study of a reddened starburst galaxy, foundcoincident with the potential radio and the X ray afterglow. We show that ourstrong I band upper limit makes of the GRB 001109 the darkest one localised bythe BeppoSAX's NFI (Narrow Field Instrument), and it is one of the mostconstraining upper limits on GRB afterglows to date. Further to it, theimplications of these observations in the context of dark GRBs are considered.

astronomy and astrophysics

On the constraining observations of the dark GRB 001109 and the properties of a<i>z</i>= 0.398 radio selected starburst galaxy contained in its error box

On the constraining observations of the dark GRB 001109 and the properties of az= 0.398 radio selected starburst galaxy contained in its error box