TITLE: GCN CIRCULAR NUMBER: 15240 SUBJECT: GRB 130907A: Maidanak optical observations DATE: 13/09/21 17:24:34 GMT FROM: Alexei Pozanenko at IKI, Moscow A. Pozanenko (IKI), A. Volnova (IKI), B. Hafizov (UBAI), O. Burhonov (UBAI) report on behalf of larger GRB follow-up collaboration: We observed the field of Swift GRB 130907A (Page et al., GCN 15183) with AZT-22 telescope equipped with SNUCAM of Maidanak observatory starting Sep., 10 (UT) 11:04:47. We obtained 2 frames with exposures of 300 s in R filter. On stacked images we clearly detect the source reported by Lee et al., (GCN 15192). The astrometry of the source is following RA(J2000) 14 23 34.01 Dec(J2000) +45 36 36.6 with uncertainty of 0.18 arcsec in both coordinates. The details of the photometry are following: t_start, filter Exposure, t-t0, OT (UT) sec mid,days 11:04:47 R 2*300 2.56166 21.44 +/- 0.16 The photometry is based on a nearby SDSS-DR9 star J142338.63+453547.2 with R mag = 18.181 +/- 0.013 (transformation by Lupton 2005)