TITLE: GCN CIRCULAR NUMBER: 43037 SUBJECT: GRB 251208D: LCO optical upper limits DATE: 25/12/08 20:27:36 GMT FROM: SVOM_group svomgroup@bao.ac.cn
D. Turpin, A. Saccardi (CEA/Irfu), D. B. Malesani (DAWN/NBI and Radboud), Z.-Y. Lin, F. Cangemi (APC), report on behalf of the SVOM mission team:
We observed the field of the SVOM GRB 251208D (Lin et al., GCN 43032) with the LCO 1m telescope at South African Astronomical Observatory equipped with the Sinistro instrument.
Our observation started on 2025-12-08 at 19:02:27 UT (about 2.18 hr after the trigger) and we obtained 3x200 s exposures in the SDSS r and 3x200 s exposures in the Pan-STARRS z filters. In the stacked image, we do not detect any new source within the ECLAIRs error circle.
We measure the following upper limits calibrated against the PanSTARRS DR1 catalog, and not corrected for Galactic extinction:
r > 21.6 AB (mid-time 2.27 hr after the trigger); z > 19.7 AB (mid-time 2.65 hr after the trigger).
This project is funded by the SVOM collaboration.
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