TITLE:   GCN CIRCULAR
NUMBER:  45328
SUBJECT: GRB 260808B: LCO optical observations
DATE:    26/08/09 09:46:24 GMT
FROM:    SVOM_group <svomgroup@bao.ac.cn>

A. Saccardi (CEA/Irfu), S. J. Yin (GXU), C. Wu (NAOC), D. Turpin (CEA/Irfu), M. Dinatolo (U. Milano), report on behalf of the SVOM mission team:

We observed the field of GRB 260808B detected by SVOM/ECLAIRs (Bouchet et al., GCN 45316; see also Wang et al., GCN 45322) with the LCO 1m telescope at South African Astronomical Observatory equipped with the Sinistro instrument.

Our observation started on 2026-08-08 at 20:29:25 UT (about 6.14 hr after the trigger) and we obtained 3x200 s exposures in the SDSS r and 3x200 s exposures in the Pan-STARRS z filters.

The optical counterpart (Turpin et al., GCN 45318; Li et al., GCN 45320; Adami et al., GCN 45323) is detected in our images. We measure the following magnitudes calibrated against the Pan-STARRS catalog, and not corrected for Galactic extinction:

r = 22.13 +/- 0.23 AB (5-sigma, mid-time 6.23 hr after the trigger).
z > 20.74 AB (3-sigma, mid-time 7.44 hr after the trigger).

This project is funded by the SVOM collaboration.