TITLE: GCN CIRCULAR NUMBER: 43530 SUBJECT: GRB 260127A: LCO optical afterglow discovery DATE: 26/01/27 19:06:16 GMT FROM: SVOM_group <svomgroup@bao.ac.cn> A. Saccardi (CEA/Irfu), D. B. Malesani (DAWN/NBI and Radboud) report on behalf of the SVOM mission team: We observed the field of GRB 260127A (Fermi GBM team, GCN 43528; Klingler et al., GCN 43529) with the LCO 1-m telescope at Siding Spring Observatory equipped with the Sinistro instrument. Our observation started on 2026-01-27 at 18:12:42 (about 22 min after the trigger) and we obtained 3x200 s exposures in the SDSS r filter. An uncatalogued optical transient is detected within the XRT error box at the following coordinates (J2000): RA = 15:27:31.14 Dec = +06:45:45.49 with an uncertainty of 0.3". No object is visible at these coordinates in the much deeper archival images from the Legacy Survey, indicating that this object is most likely the optical afterglow of GRB 260127A. We measure the following magnitude, calibrated against the Pan-STARRS catalog, and not corrected for Galactic extinction: r = 20.45 +/- 0.20 AB (mid-time of 27.3 min after the trigger). Further observations are planned. This project is funded by the SVOM collaboration. View this GCN Circular online at https://gcn.nasa.gov/circulars/43530. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...