TITLE: GCN CIRCULAR NUMBER: 6925 SUBJECT: GRB071013: optical observations DATE: 07/10/16 18:57:43 GMT FROM: Alexei Pozanenko at IKI, Moscow G. Kornienko, A. Erofeeva (UAFO), A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration report: We observed the error box of GRB071013 (Marshall et al., GCN 6907) on Oct.13 with SR-22 telescope of UAFO observatory. A set of 50 unfiltered images of 60 s exposure was obtained starting (UT) 12:33:04. In images between 12:39:04 - 12:49:04 we observed an object at the position RA(J2000) = 18:37:49.1 Dec(J2000)= +33:50:25 with uncertainties of 3" in both coordinates. The object is not visible before and after this time (UT)12:39:04 - 12:49:04. The object is in refined BAT error circle (Palmer et al., GCN 6911). Based on nearby USNO-A2.0 stars we estimate brightness of the object as R~18.2. The source of USNO-B1.0 1238-0299614 (RA(J2000)=18 37 48.84 Dec(J2000)= +33 50 26.7) sits close (or coincides) to our object and it has R2=19.6. The photometry of the source in deep TLS observation (Kann et al., GCN 6917) is R=19.5 (Kann, private communication). If the USNO-B1.0 1238-0299614 source is a galaxy, then the afterglow may be masked of the galaxy in later times. At this time we cannot confirm the nature of the found object and we encourage to refine observations at the same period (Xin et al., GCN 6908). The message may be cited.