GCN Circular 37937
Subject
GRB 241029A: TRT optical afterglow candidate detection
Date
2024-10-29T10:59:47Z (4 days ago)
From
Dong Xu at NAOC/CAS <dxu@nao.cas.cn>
Via
Web form
S.Q. Jiang, S.Y. Fu (NAOC), S. Tinyanont, R. Anutarawiramkul, P. Butpan (NARIT), J. An, 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 field of GRB 241029A detected by Fermi/GBM (Fermi GBM team, GCN 37932), SVOM/ECLAIRs & SVOM/GRM (Schanne et al., GCN 37934; Wang et al., GCN 37935), using the 0.7-m telescope of the Thai Robotic Telescope network (TRT), located at Springbrook Observatory, New South Wales, Australia. Observations started at 09:49:01.281 UTC on 2024-10-29, i.e., 7.486 hrs after the SVOM/ECLAIRs trigger, and a series of 360 s frames were obtained in R-band.
An uncatalogued source is clearly detected in our stacked image within the SVOM/ECLAIRs error circle (Schanne et al., GCN 37934) at coordinates:
R.A. (J2000) = 21:41:20.16
Dec. (J2000) = +05:04:53.31
with an uncertainty of ~ 0.5 arcsec. The source has R = 20.06 +/- 0.08, calibrated with nearby PanSTARRS stars and not corrected for Galactic extinction. NEO can be ruled at this position at the observational time by checking MPC. No other credible candidate is found within the SVOM/ECLAIRs error circle.
We conclude that the source is likely the optical afterglow of the burst.