TITLE: GCN CIRCULAR NUMBER: 35828 SUBJECT: GRB 240225B: SAO RAS optical observations DATE: 24/02/28 22:16:52 GMT FROM: Moskvitin Alexander at SAO RAS <mosk@sao.ru> A. S. Moskvitin, O. I. Spiridonova (SAO RAS) report on behalf of the GRB follow-up team. We observed the field of GRB 240225B (Nakajima et al., GCN 35796; Evans, GCN 35797; Joshi et al., GCN 35798; D'Ai et al., GCN 35810; Kawakubo et al., GCN 35811) with the SAO RAS 1m telescope Zeiss-1000 equipped with CCD-photometer. We obtained 8 x 300 sec frames in the Rc band on Feb. 28, 18:20:36--19:11:22 UT (t_mid - T0 = 2.9307 days). The OT (Gompertz et al., GCN 35805; Liu et al., GCN 35812; Malesani et al., GCN 35819; Wise et al., GCN 35820; Gompertz & Malesani, GCN 35824; Pankov et al., GCN 35826) is clearly detected in our stacked frame with the brightness of R = 20.51 +/- 0.02. The photometry is based on nearby SDSS stars (magnitudes converted with Lupton 2005 equations). View this GCN Circular online at https://gcn.nasa.gov/circulars/35828. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...