TITLE: GCN CIRCULAR NUMBER: 16554 SUBJECT: GRB 140709A: BOOTES-2 and OSN optical observations DATE: 14/07/09 16:51:28 GMT FROM: Juan Carlos Tello at IAA-CSIC A.J. Castro-Tirado (IAA-CSIC, ISA-UMA), J. Gorosabel (IAA-CSIC, UPV-EHU), J. C. Tello, R. Cunniffe, A. Gonzalez-Rodriguez, A. Sota, M. Jelinek, S. Jeong, O. Lara-Gil, S. R. Oates, R. Sanchez-Ramirez (IAA-CSIC, Granada), P. Kubanek (IP-ASCR, Prague) and S. Pandey (ARIES) report: Following the detection of GRB 140709A by Swift (Hagen et al., GCNC 16546), the 0.6m TELMA robotic telescope at the BOOTES-2 astronomical station Malaga (Spain), responded to the GRB location starting at 01:14:41 UT (i.e. 60s postburst, in the clear filter, 5s integrations), with an upper limit of R > 16.5. Further optical observations were carried out at the 1.5m OSN telescope starting on July 9.06-9.12 UT (i.e. 0.37--1.72 hours post GRB). A source coincident with the enhanced XRT position is found (Evans et al. GCN 16548) at coordinates RA(J2000) = 20:18:38.95, DEC(J2000) = 51:13:29.6 (+/-0.5") when the 78x60s frames are co-added. Using USNO-B1.0 as reference, we measure a Vega magnitude of I = 20.8 (uncorrected for Galactic reddening), which is the potential optical afterglow. At the present stage we do not know is the source is fading or not. We also detect the object reported by RATIR (Butler et al. GCN 16547), which is not consistent with the position of our candidate. Further observations are planned.