TITLE: GCN CIRCULAR NUMBER: 38105 SUBJECT: GRB 241030A: Mondy optical observations DATE: 24/11/06 20:35:06 GMT FROM: Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru> N. Pankov (HSE, IKI), A. Pozanenko (IKI), E. Klunko (ISTP) report on behalf of IKI-GRB-FuN: We continued observations of the optical afterglow (Klingler et. al, GCN 37956; Watson et. al, GCN 37957; Fernández-Rodríguez et. al, GCN 37958; An et. al, GCN 37960; Higuchi et. al, GCN 37963; SVOM/VT commissioning team, GCN 37965; Lin et. al, GCN 37966; SVOM/C-GFT team, GCN 37970; Breeveld & Klingler, GCN 37974; Odeh et. al, GCN 37976; Méndez-Lapido et. al, GCN 37993; Antier et. al, GCN 38000; Moskvitin & Goranskij, GCN 38016; Busmann et. al, GCN 38019; Schneider et. al, GCN 38021; Li et. al, GCN 38027; Masi, GCN 38031; Moskvitin & Goranskij, GCN 38032; Yan et. al, GCN 38035; The TESS Mission, GCN 38050; Wang et. al, GCN 38055;) of a likely long GRB 241030A (The Fermi GBM team, GCN 37955; Klingler et. al, GCN 37956; SVOM/GRM team, GCN 37972; R. Pillera et. al, GCN 37979; Liang et. al, GCN 38026; Pal et. al, GCN 38074;) at the redshift of z ~ 1.411 (Zheng et. al, GCN 37959, Li et. al, GCN 38027) with 1.5-meter AZT-33IK telescope of Sayan (Mondy) observatory. Four observa! tions were carried out since 2024-10-31 until 2024-01-04. All observations were taken in the R-filter using the CMOS-photometer Andor Neo. We clearyl detect the optical afterglow on the 2024-10-31 epoch, and tentatively detect a possible host galaxy of GRB 241030A on other epochs. The preliminary photometry is given below: Date UTstart t-T0 Exp. Filter OT Err UL (mid, days) (n*s) (3sigma) 2024-10-31 11:25:44 1.253254 27*120 R 20.43 0.09 22.3 2024-11-02 11:50:32 3.272567 30*120 R 22.8 0.4 22.7 2024-11-03 11:59:10 4.278553 30*120 R 22.7 0.3 22.7 2024-11-04 11:40:01 5.264565 29*120 R 22.6 0.4 22.5 The magnitudes were calibrated against stars of the PanSTARSS-PS1 catalog. RA Dec R(Lupton transformations) 343.1048 +80.4430 17.287 343.2647 +80.4324 17.828 The reported magnitudes were not corrected for the Galactic extinction towards the GRB 241030A. From our observations we can suggest that photometry starting from 2024-11-02 could be the photometry of the host galaxy. View this GCN Circular online at https://gcn.nasa.gov/circulars/38105. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...