TITLE: GCN CIRCULAR NUMBER: 6558 SUBJECT: GRB 070612A: TNG optical observations DATE: 07/06/20 10:55:14 GMT FROM: Paolo D'Avanzo at INAF-OAB P. D'Avanzo, S. Covino (INAF-OAB), M. Della Valle (INAF-OA Arcetri), E. Pian (INAF - OATs), G. Tagliaferri on behalf of the CIBO collaboration, P. Mazzali (INAF - OATs & MPA), A. Magazzu` and Noemi Pinilla-Alonso (INAF - TNG) report: We observed the afterglow (Updike et al., GCN 6515; Cenko et al., GCN 6525) of GRB 070612A (Grupe et al., GCN 6509) with the Italian 3.6m TNG telescope equipped with the DOLORES camera on 2007 Jun 18.89 and 19.90 UT. Because of visibility constraints, images have been taken at high airmass (~ 3). The average seeing was of about 1.7". An extended object is clearly visible at the position of the optical afterglow (Cenko et al., GCN 6525) and its brightness remains constant at both epochs at a level of R ~ 21.4 (calibrated against the USNO B1.0 catalog). This is consistent to what reported by Malesani et al. (GCN 6555) and suggests that the afterglow's brightness is now below the host galaxy level. We acknowledge the support of the TNG staff.