TITLE: GCN CIRCULAR NUMBER: 6969 SUBJECT: GRB 071010B: Fading quickly DATE: 07/10/22 01:03:04 GMT FROM: Myungshin Im at Seoul Nat U M. Im, I. Lee (Seoul National University), and Y. Urata (Saitama University) on behalf of the EAFON team: Using the Mt. Lemmon (Arizona, US) 1.0m telescope operated by the Korea Astronomy Space Science Institute, we continued our observation of GRB071010B (GCN 6871, Markwardt et al.), beginning at 11:00:20 UT on Oct 21. (10.59 days after the burst). Now, the optical afterglow (GCN 6873, Oksanen et al.) is very faint, and we have only a very marginal detection in our data. The faintness of the afterglow further confirms the light curve break (GCN6935, Kann et al.; GCN6957, Im, Lee, and Urata, et al.), and the GRB is quickly fading. Photometry of the object is given below. t_start (UT) Filter exp (sec) R-mag err ----------------------------------------------------- Oct. 21, 11:00:20 R 16x300 23.0 0.6 This message may be cited.