GCN Circular 10954
P. D'Avanzo (INAF-OAB), L. A. Antonelli (INAF-OAR), V. D'Elia (ASDC), D. Fugazza (INAF-OAB), A. de Ugarte Postigo (INAF-OAB), D. Malesani (DARK/NBI) on behalf of the CIBO collaboration report: We observed the field of GRB100713A (Mereghetti et al. GCN 10951) with the Italian 3.6m TNG telescope (La Palma, Canary Islands) equipped with the DOLORES camera operated in imaging mode. Observations started on Jul 13 at 21:25 UT (~6.8 after the GRB) and were carried out in R and I band for a total exposure time of 900s and 540s, respectively. We do not detect any source within the XRT error circle (D'Elia et al., GCN 10952) in both filters down to a limiting magnitude of I~22.6 and R~23.6 (3sigma c.l., calibrated against the USNO B1 catalogue). We note the presence of a faint source visible in both our images and the SDSS close to the the border of the XRT error circle at the following coordinates (J2000): R.A.=17:00:48.1 Dec=+28:23:45.7 We thank Gian Paolo Tozzi and Giovanni Mainella for performing the observations and for their support.