TITLE: GCN CIRCULAR NUMBER: 6926 SUBJECT: GRB 071013: TLS 2nd epoch - Kornienko candidate constant DATE: 07/10/16 19:51:44 GMT FROM: Alexander Kann at TLS Tautenburg D. A. Kann, C. Hoegner, U. Laux & R. Filgas (TLS Tautenburg) report: We observed the field of GRB 071013 (Marshall et al., GCN 6907) with the Tautenburg 1.34m Schmidt telescope under good conditions, obtaining 6 300 second images in the Rc band at 3.2 days after the GRB. We use the same comparison star as given in Kann, Hoegner & Filgas (GCN 6917), and find the following magnitudes of the possible variable source discovered by Kornienko et al. (GCN 6925): Date Mid-Time Rc dRc 13.74086 0.23439 19.537 0.027 13.75231 0.24584 19.506 0.028 13.76103 0.25456 19.634 0.040 13.76977 0.26330 19.566 0.032 13.77850 0.27203 19.704 0.036 13.78723 0.28076 19.629 0.038 13.79596 0.28950 19.683 0.045 13.80469 0.29822 19.593 0.044 13.81342 0.30695 19.589 0.038 13.82216 0.31569 19.635 0.028 13.83088 0.32441 19.598 0.044 13.83961 0.33314 19.572 0.040 13.84834 0.34187 19.762 0.054 Thus, we see no significant variability in the source over the span from 0.23 to 0.34 days after the GRB. For the second epoch, we combine the 6 300 second images and find, using the same comparison star: Date Mid-Time Rc dRc 16.75845 3.25198 19.583 0.015 Thus, we also see no variability between 0.3 and 3.3 days after the GRB. If this source is at low redshift and possibly associated with a supernova, there is no evidence for it yet. Further photometric follow-up and spectroscopy of the USNO/DSS source is encouraged. This message may be cited.