TITLE:   GCN CIRCULAR
NUMBER:  46202
SUBJECT: GRB 261108C: LCO optical upper limits
DATE:    26/11/09 02:37:48 GMT
FROM:    SVOM_group <svomgroup@bao.ac.cn>

A. Saccardi(CEA/Irfu), Y.Y. Shi (GXU), D. Turpin (CEA/Irfu), S.J. Yin (GXU), C. Wu, L.P. Xin (NAOC), Y.X. Guan (GXU), R. Hamburg (USRA), M. Gnaoui (IAP) report on behalf of the SVOM mission team:


We observed the field of GRB 261108C (SVOM burst-id sb26110812) detected by SVOM (Hamburg et al., GCN 46198) with the LCO 1m telescope at South African Astronomical Observatory equipped with the Sinistro instrument.

Our observation started on 2026-11-08T21:23:19 UT (about 4.15 min after the trigger) and we obtained 3x200 s exposures in the SDSS r and 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 limits calibrated against the DESI Legacy Imaging Surveys DR10 catalog, and not corrected for Galactic extinction:

r > 22.1 AB (5-sigma, mid-time 27.10 min after the trigger),
z > 19.9 AB (5-sigma, mid-time 9.58 min after the trigger).

This project is funded by the SVOM collaboration.