TITLE:   GCN CIRCULAR
NUMBER:  42705
SUBJECT: GRB 251116C: LCO optical upper limits
DATE:    25/11/16 20:07:59 GMT
FROM:    SVOM_group <svomgroup@bao.ac.cn>

D. Turpin, A. Saccardi, J. T. Palmerio (CEA/Irfu), L. P. Xin (NAOC), C. Wu (NAOC), B. Cordier (CEA/Irfu), M. Pillas (IAP), M.G. Bernardini (INAF-OAB, LUPM), report on behalf of the SVOM mission team:

We observed the field of GRB 251116C (Pillas et al., GCN 42703) with the LCO 1m telescope at the South African Astronomical Observatory (SAAO) equipped with the Sinistro instrument.

Our observation started at 2025-11-16T18:45:47 about 2.8 hours after the SVOM/ECLAIRs trigger time. We obtained 3x200 s exposures in the SDSS r and 3x200s exposures in the PanSTARRS z filters. No any uncatalogued source was identified in our stacked frames.

We measure the following upper limits (5 sigma) calibrated against the PanSTARRS DR1 catalog, and not corrected for Galactic extinction:

r = 21.5  (AB) T_mid - T0 = 3.1 hr
z = 19.9 (AB) T_mid - T0 = 2.9 hr

This project is funded by the SVOM collaboration.