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.