TITLE: GCN CIRCULAR NUMBER: 11524 SUBJECT: GRB 110106A: TNG optical observations and candidate counterparts DATE: 11/01/06 21:38:53 GMT FROM: Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst D. Malesani (DARK/NBI), S. Covino (INAF/Brera), L.A. Antonelli (INAF/Roma), D. Fugazza (INAF/Brera), A. Harutyunyan (INAF/TNG), G. Tessicini (INAF/TNG) on behalf of the CIBO collaboration, report: We observed the field of GRB 110106A (Mangano et al., GCN 11520) using the 3.6m TNG telescope, located in the Canary Islands. A set of R- and I-band images were acquired starting on Jan 6.8265 UT (4.41 hr after the GRB) for a total exposure time of 20 minutes per filter. The seeing was 1.5" in the R band. Within the XRT error circle (Mangano et al., GCN 11520), we marginally detect a source in both R and I. Its coordinates are (J2000): RA = 05:17:14.14 Dec = 64:10:28.1 and its magnitude is R ~ 24.5. In addition, we note the presence of a galaxy just outside the current X-ray error circle (its centroid being 7.3+-3.6" away of the XRT position). It is visible also in the DSS images and has a magnitude R = 18.2 (assuming R = 17.54 for the star at RA=05:17:11.43, Dec=+64:10:10.88). We cannot assess whether any of the sources are variable, and so their relation to GRB 110106A remains to be proven. Further observations are in progress. [GCN OPS NOTE(06jan11): Per author's request, GT was added to the author list.]