TITLE: GCN CIRCULAR NUMBER: 40963 SUBJECT: EP250704a / GRB 250704B: SAO RAS optical observations DATE: 25/07/05 01:03:17 GMT FROM: Alexander Moskvitin at SAO RAS <mosk@sao.ru> A. Moskvitin, O. Spiridonova (SAO RAS), report on behalf of a GRB follow-up collaboration. We observed the field of the GRB 250704B (Wang et al., GCN 40940), EP250704a (Li et al., GCN 40941) with SAO RAS 1-m telescope Zeiss-1000 equipped with CCD-photometer. We obtained 6 x 300 sec. exposures in Rc band on July 4, 22:55:08--23:38:07 UT (t_mid - T0 = 15.00 hours). The OT (Schneider et al., GCN 40942; Malesani et al., GCN 40945; Brivio et al., GCN 40947; Perez-Garcia et al., GCN 40957; Gillanders et al., GCN 40958; Xin et al., GCN 40960; Mohan et al., GCN 40962) is clearly detected in our stacked image with the brightness of R = 20.80 +/- 0.18. Preliminary photometry is based on the nearby USNO-B1.0 stars and has not corrected for the Galactic extinction. View this GCN Circular online at https://gcn.nasa.gov/circulars/40963. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...