TITLE: GCN CIRCULAR NUMBER: 15696 SUBJECT: GRB 140105A: continued iPTF observations and rejection of optical candidates DATE: 14/01/07 06:03:23 GMT FROM: Leo Singer at CIT/PTF L. P. Singer (Caltech), M. M. Kasliwal (Carnegie Observatories/Princeton), S. B. Cenko (NASA/GSFC), E. Bellm (Caltech), and Y. Cao (Caltech) report on behalf of the intermediate Palomar Transient Factory (iPTF) collaboration: We have continued to observe four optical transients (Singer et al., GCN 15686) in the Fermi GBM error circle for GRB 140105A (Xiong & Connaughton, GCN 15688) with the Palomar 48-inch Oschin telescope (P48), the robotic Palomar 60-inch (P60), and the Palomar 200-inch (P200) equipped with the Double Beam Spectrograph (DBSP). At 33 hours after the burst, with the P48 we obtain the following host-subtracted magnitudes in the Mould R filter: iPTF14x, R = 20.0 iPTF14ac, R = 20.3 iPTF14ae, R = 20.5 With the P60, at 34 hours after the burst, we obtain the following magnitude in the SDSS system: iPTF14ai, r = 20.4 We obtained spectra of all four with the P200. iPTF14x resembles a Type II supernova. Our spectra for iPTF14ac, iPTF14ae, and iPTF14ai show a mostly featureless continuum. The lack of significant optical fading in any of the four candidates strongly argues against association with the GRB.