TITLE:   GCN CIRCULAR
NUMBER:  37960
SUBJECT: GRB 241030A: TRT optical observations
DATE:    24/10/30 09:54:50 GMT
FROM:    Dong Xu at NAOC/CAS <dxu@nao.cas.cn>

J. An, S.Y. Fu (NAOC), S. Tinyanont, R. Anutarawiramkul, P. Butpan (NARIT), S.Q. Jiang, X. Liu, Z.P. Zhu, Z. Fan, W.X. Li, N.C. Sun, Y.N. Wang, D. Xu (NAOC) report on behalf of a large collaboration:

We observed the optical afterglow of GRB 241030A detected by Fermi/GBM (Fermi GBM team, GCN 37955) and Swift/BAT (Klingler et al., GCN 37956), using the 0.7-m telescope of the Thai Robotic Telescope network (TRT), located at Fresno, California, U.S.A.

Observations started at 06:14:49.0 UTC on 2024-10-30, i.e., 27 mins after the Swift/BAT trigger, and we obtained a series of 60 s, 90 s, and 180 s frames in the R-filter.

The optical afterglow was decaying during our observations, and had R = 14.77 +/- 0.01 mag at 0.45 hr post-trigger, calibrated with nearby Pan-STARRS stars and not corrected for Galactic extinction.