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GCN Circular 37940

Subject

GRB 241029A: Xinglong-2.16m optical afterglow confirmation

Date

2024-10-29T14:45:50Z (16 days ago)

Edited On

2024-10-29T14:49:23Z (16 days ago)

From

Dong Xu at NAOC/CAS <dxu@nao.cas.cn>

Edited By

Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov> on behalf of Dong Xu at NAOC/CAS <dxu@nao.cas.cn>

Via

Web form

S.Q. Jiang, Z.P. Zhu, S.Y. Fu, J. An, X. Liu, L.P. Xin, X.H. Han, J. Wang, D. Xu, C. Wu, J.Y. Wei (NAOC) report:

We observed the field of GRB 241029A detected by Fermi/GBM (Fermi GBM team, GCN 37932Not found
 
 
), SVOM/ECLAIRs & SVOM/GRM  (Schanne et al., GCN 37934Not found
 
 
; Wang et al., GCN 37935Not found
 
 
) using the 2.16m telescope located at Xinglong, Hebei, China, equipped with the BFOSC camera. Observations started at 13:17:07 UT on 2024-10-29, i.e., 10.95 hr after the SVOM/ECLAIRs trigger, and a series of 360 s frames were obtained in R-band.

The previously reproted optical source (Jiang et al., GCN 37937Not found
 
 
; Lin et al., GCN 37939Not found
 
 
) is clearly detected in the stacked image, and it has decayed to R = 20.52 +/- 0.04 at 11.21 hr after the SVOM/ECLAIRs trigger, calibrated with nearby PanSTARRS stars and not corrected for Galactic extinction. We thus think the source is the optical afterglow of the burst.  

We thank the great support of the Xinglong-2.16m staff, in particular Yinan Zhu and Jie Zheng.