TITLE: GCN CIRCULAR NUMBER: 43398 SUBJECT: GRB 260114A: GMG Optical Observation DATE: 26/01/14 13:39:46 GMT FROM: Rui-Zhi Li at Yunnan Observatories, CAS <liruizhi@ynao.ac.cn> R.-Z. Li, J. Mao, B.-T. Wang, F.-F. Song, Y. Wang, J.-G. Wang and B. Wang (YNAO, CAS) report: We observed the field of GRB 260114A (Eyles-Ferris et al., GCN 43396; Fermi GBM team, GCN 43395; T0 at 2026-01-14T11:40:26) using the GMG-2.4m telescope at the Lijiang Observatory. The observation began at 2026-01-14T12:18:52, about 0.64 hours after the trigger. We detected an optical source within the Swift/XRT error circle (Eyles-Ferris et al., GCN 43396). The preliminary analysis results for this source are presented below. +---------------+------------+----------+--------------+----------------+ | Tmid-T0 [h] | Exp. [s] | Filter | Mag | 5-sigma U.L. | +===============+============+==========+==============+================+ | 0.81 | 1200 | r | 21.19 ± 0.06 | 22.6 | +---------------+------------+----------+--------------+----------------+ We note that an extended galaxy (R.A., Dec. = 04:58:23.41, −08:00:49.6; r = 21.47 mag in the Pan-STARRS DR2 image) is located within the Swift/XRT error circle. Three objects within the Swift/XRT error circle have photometric redshifts of z ~ 0.5 in the DESI Legacy Surveys. Given the poor seeing conditions at the Lijiang Observatory, no additional candidate sources in our image were found within the Swift/XRT error circle. The given magnitudes are derived based on calibration against Pan-STARRS1 field stars, and are not corrected for the expected Galactic foreground extinction, corresponding to a reddening of E(B-V) = 0.0685 mag in the direction of the optical source (Schlafly & Finkbeiner 2011). View this GCN Circular online at https://gcn.nasa.gov/circulars/43398. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...