GCN Circular 14564
J. Gorosabel (IAA-CSIC/UPV-EHU), A. de Ugarte Postigo (IAA-CSIC/DARK-NBI), J.C. Tello (IAA-CSIC), A.J. Castro-Tirado (IAA-CSIC), J. Cepa (IAC), D. Jimenez-Mejias (IAC), J.L. Doreste Caballero (HGT), D. Hernandez Ojados (SECAT), R. Sanchez-Ramirez (IAA-CSIC), report on behalf of a larger collaboration: We observed the GRB 130504A field (BAT trigger 555096; Cummings et al. GCN 14551) with the 0.82m IAC80 telescope. The data were acquired in the I-band. The observations started at 02:22:30.6 UT (~17 min post burst) and lasted ~1.5 hours. An object, coincident with the enhanced XRT position (D'Avanzo et al. 14558), shows a clear fading in our images. The optical candidate is placed at RA(J2000)=18:09:49.44, DEC(J2000)=-16:18:48.0 with a Vega magnitude of I=18.1 (against USNO B1.0) in our first images.