TITLE:   GCN CIRCULAR
NUMBER:  46190
SUBJECT: GRB 261108A: LCO optical upper limits
DATE:    26/11/08 04:02:19 GMT
FROM:    SVOM_group <svomgroup@bao.ac.cn>

Y.X. Guan, Y.Y. Shi(GXU), A. Saccardi, D. Turpin (CEA/Irfu),  C. Wu , L.P. Xin,(NAOC), S.J. Yin(GXU), X.H. Han(NAOC), Y.D. Hu(GXU), Clara Plasse(HKU),
 report on behalf of the SVOM mission team:

We observed the field of GRB 261108A (detected by SVOM burst-id sb26110802
 (Xie et al., GCN 46186) with the LCO 1m telescope at Cerro Tololo Inter-American Observatory equipped with the Sinistro instrument.

Our observation started on 2026-11-08T01:17:20 UTC (about 4.2 min after the trigger) and we obtained 3x200 s exposures in the SDSS r filter 3x200 s exposures in the Pan-STARRS z filter.

In the stacked image, we do not detect any new source within the SVOM/ECLAIRs error box. We measure the following upper limit calibrated against the Pan-STARRS DR1 catalog, and not corrected for Galactic extinction:

r > 22.6  AB (5-sigma, mid-time 9.6 min after the trigger);
z > 20.5  AB (5-sigma, mid-time 34.8 min after the trigger).

This project is funded by the SVOM collaboration.