TITLE: GCN CIRCULAR NUMBER: 13489 SUBJECT: GRB 120716A: Candidate Optical Afterglow from PTF DATE: 12/07/19 00:01:37 GMT FROM: S. Bradley Cenko at Caltech S. B. Cenko (UC Berkeley), E. O. Ofek (Weizmann Institute of Science), and P. E. Nugent (Lawrence Berkeley National Laboratory / UC Berkeley) report on behalf of a larger collaboration: We have imaged the location of the IPN GRB 120716A (Hurley et al., GCN 13487) with the Palomar 48 inch Oschin Schmidt telescope as part of the Palomar Transient Factory (PTF). Images were obtained in the r' filter beginning at 4:25 UT on 18 July 2012 (~ 1.5 d after the IPN trigger). Within the IPN localization, we identify a new point source with coordinates: RA: 20:52:12.10 Dec: +09:35:53.7 (J2000.0) Using several nearby stars from the Sloan Digital Sky Survey for reference, we measure a magnitude of r' ~ 20.4 at this time. Nothing is detected at this location in previous PTF imaging of this field, with images beginning in June 2011. Furthermore, no source is detected in archival SDSS imaging of this location (a faint nearby object in the SDSS database, SDSS J205212.01+093551.9, appears to be of very low significance). However, our most recent epoch of PTF imaging was obtained in March 2012, so we cannot currently rule out the chance alignment of an unassociated foreground or background transient. Further observations of this candidate optical afterglow are planned.