TITLE: GCN CIRCULAR NUMBER: 38016 SUBJECT: GRB 241030A: SAO RAS optical observations DATE: 24/10/31 17:15:46 GMT FROM: Moskvitin Alexander at SAO RAS <mosk@sao.ru> A. S. Moskvitin (SAO RAS) and V. P. Goranskij (SAI MSU) report on behalf of the GRB follow-up team. We observed the field of the GRB 241030A (Klingler et al., GCN 37956; Beardmore et al., GCN 37962; Wang et al., GCN 37972; Pillera et al., GCN 37979; Ridnaia et al., GCN 37982; Ambrosi et al., GCN 37988; Wu et al., GCN 37997) with the 1-m telescope of SAO RAS, Zeiss-1000 equipped with the CCD-photometer on October 30/31 night. We obtained series of 300 and 600 sec. images in Rc band. The OT (Klingler et al., GCN 37956; Watson et al., GCN 37957; Fernández-Rodríguez et al., GCN 37958; Zheng et al., GCN 37959; An et al., GCN 37960; Higuchi et al., GCN 37963; Qiu et al., GCN 37965; Lin et al., GCN 37966; Wu et al., GCN 37970; Breeveld & Klingler, GCN 37974; Méndez-Lapido et al., GCN 37993) is clearly detected in our stacked frames. Preliminary photometry calibrated against nearby Pan-STARRS stars (magnitudes converted with Lupton 2005 equations) and not corrected by MW extinction: date UT_start--UT_end t_mid-T0, h exp., s R_mag Oct. 30 17:21:38--17:26:38 11.8392 6 x 300 18.72 +/- 0.04 Oct. 30 20:40:51--21:44:59 15.4145 6 x 600 19.09 +/- 0.06 Oct. 30/31 23:18:20--02:14:51 18.9756 15 x 600 19.36 +/- 0.04 list of used Pan-STARRS stars: R.A. (J2000) Decl. (J2000) R_mag (Lupton 2005) 343.156212740 80.434129340 14.119 343.189894620 80.452656920 17.502 343.155709870 80.466614280 16.501 343.372455850 80.465046470 14.448 View this GCN Circular online at https://gcn.nasa.gov/circulars/38016. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...