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GCN Circular 46248

Subject
GRB 261113A: JinShan optical afterglow detection
Event
GRB 261113A
Date
2026-11-13T15:57:38Z (2 days ago)
From
liuxing@nao.cas.cn
Via
Web form

L. Lei (HUST), X. Liu, D. Xu, J. An, L.B. He, S.Q. Jiang, Z.P. Zhu (NAOC), A.D. Zhu (HUST) report:

We observed the field of GRB 261113A detected by SVOM/ECLAIRs (GCN 46244) using the 100A and 100C telescopes of the JinShan project locate at Altay, Xinjiang, China. A series of Sloan r-band frames were obtained.

An uncatalogued and varying optical source is detected within the SVOM/ECLAIRs error circle at coordinates

R.A. (J2000) = 23:05:16.96
Dec. (J2000) = +5:10:18.65

with an uncertainty of ~1 arcsec. The source has r = 19.14 +/- 0.05 mag at a median time of 0.5 hr post-trigger, calibrated with nearby PanSTARRS stars.

We thus think the source is the optical afterglow of GRB 261113A.
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