TITLE: GCN CIRCULAR NUMBER: 36561 SUBJECT: GRB 240529A: NOT optical observations DATE: 24/05/29 10:55:16 GMT FROM: Dong Xu at NAOC/CAS <dxu@nao.cas.cn> S.Y. Fu, J. An, Z.P. Zhu, X. Liu, S.Q. Jiang, D. Xu (NAOC), D. B. Malesani (DAWN/NBI and Radboud), J. Terwel (NOT) report on behalf of a large collaboration: We observed the field of GRB 240529A detected by Swift (Eyles-Ferris et al., GCN 36556) using the 2.56-m Nordic Optical Telescope (NOT) equipped with the ALFOSC camera, and obtained 3 x 100 s frames in the Sloan r-band and 3 x 100 s frames in z-band, starting at 04:51:50.7 UT on 2024-05-29, i.e., 1.89 hr after the BAT trigger. The optical afterglow (Eyles-Ferris et al., GCN 36556; Kumar et al. GCN 36559) of the burst is clearly detected in our stacked images. Preliminary photometry results are as follows: Tmid (UT) Tmid-T0(hr) Mag MagErr Filter 2024-05-29T04:54:47 1.94 16.48 0.05 r 2024-05-29T05:01:30 2.05 15.40 0.05 z calibrated with nearby PanSTARRS stars. View this GCN Circular online at https://gcn.nasa.gov/circulars/36561. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...