TITLE:   GCN CIRCULAR
NUMBER:  46078
SUBJECT: GRB 261029A: TRT optical observations
DATE:    26/10/29 04:24:56 GMT
FROM:    L. B. He at NAOC <helb@bao.ac.cn>

L.B. He (NAOC), K. Noysena, K. Chanchaiworawit, S. Tinyanont (NARIT), J. An(NAOC), S.Y. Fu(HUST), S.Q. Jiang(NAOC), L. Lei(HUST), X. Liu, D. Xu, Z.P. Zhu (NAOC) report:

We observed the field of GRB 261029A detected by Fermi (Fermi GBM Team, GCN 46071) and potentially also by SVOM (Goto et al., GCN 46072), using the 0.7-m telescope of the Thai Robotic Telescope network (TRT). A series of Johnson R-band frames were obtained.

The previously reported optical counterpart (O'Neill et al., GCN 46073) is clearly detected in our first image with a brightness of R = 17.41 +/- 0.14 at a median time of 2.30 hrs since the Fermi trigger, calibrated with Pan-STARRS DR2 stars in the field and not corrected for Galactic extinction.

Observations are still ongoing.