TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3601 SUBJECT: GRB050712: TNG R-band observations DATE: 05/07/13 21:17:39 GMT FROM: Nicola Masetti at IASF,CNR,Bologna E. Maiorano, E. Palazzi, N. Masetti (INAF/IASF, Bo), D. Malesani (SISSA), P. D'Avanzo (INAF, OAB), G.L. Israel (INAF, OARm), G. Chincarini (Univ. Milano-Bicocca), L. Stella (INAF, OARm) and M. Pedani (INAF, TNG) report on behalf on a larger collaboration: "We observed the field of GRB 050712 (Grupe et al., GCN 3573; Falcone et al., GCN 3574) with the Italian TNG telescope, located at the Canary Islands. The field was observed before twilight, under a seeing of ~1.4 arcsec, starting on 2003 Jul 13.182 UT (~14.4 h after the GRB). A set of six images, 300 s exposure time each, was acquired in the R filter. Within the XRT error circle (Grupe et al., GCN 3579) we find one source, at a position consistent with that of the OT detected with UVOT (Rol et al., GCN 3575; see also Zeh et al., GCN 3587). Assuming R = 15.8 for the USNO-A2.0 star U1500_0409875 at RA = 05:11:10.51, Dec = +64:55:36.0 (J2000), we measure for the object above a magnitude R = 21.35 +/- 0.05. Further analysis is in progress. This message can be cited."