TITLE: GCN CIRCULAR NUMBER: 16504 SUBJECT: GRB 140703A: BOOTES-2 and OSN optical observations DATE: 14/07/03 03:30:45 GMT FROM: Alberto Castro-Tirado at Inst.de Astro. de Andalucia R. Cunniffe, A. Gonzalez-Rodriguez, V. Casanova, M. Jelinek, S. Jeong, O. Lara-Gil, S. R. Oates, R. Sanchez-Ramirez, J. C. Tello (IAA-CSIC Granada), P. Kubanek (IP-ASCR, Prague), J. Gorosabel (IAA-CSIC, UPV-EHU) and A. J. Castro-Tirado (IAA-CSIC, ISA-UMA), report: Following the detection of GRB 140703A by Swift (Kocevski et al., GCNC 16503), the 0.6m TELMA robotic telescope at the BOOTES-2 astronomical station Malaga (Spain), responded to the GRB location starting at 00:38:02 UT (i.e. 45s postburst, in the clear filter, 5s integrations). In the longer exposures (i'-band, 60s) starting at 00:47:30 (i.e. 10 min postburst), a faint optical source is barely detected in the images, at the outskirts of the XRT position, which is confirmed by the 1.5m OSN images at Sierra Nevada Observatory starting at 00:54 UT (I-band), with a magnitude of about 20, which does not seem to be present in the DSS-2. The preliminary position (+/- 1") is: RA(J2000) = 00 51 59.05, Dec (J2000) = +45 06 06. The source is detected in all optical filters. Additional observations (imaging and spectroscopy) are ongoing. [GCN OPS NOTE(03jul14): Per author's request, the starting time was changed from 00:30:02 to 00:38:02 (ie 8 min later), and the characterset represenation for the i'-band specification was changed to plain-text.]