TITLE:   GCN CIRCULAR
NUMBER:  45901
SUBJECT: GRB 261011A: LCO optical observations
DATE:    26/10/11 15:53:31 GMT
FROM:    SVOM_group <svomgroup@bao.ac.cn>

S.J. Yin(GXU),J.G. Ducoin(CPPM),D. B. Malesani (DAWN/NBI and Radboud),  C. Wu (NAOC), A. Saccardi (CEA/Irfu), L.P. Xin, X.H. Han, P.P. Zhang (NAOC),Y.Y .Shi, Y.X. Guan(GXU), Massimiliano Lincetto (CPPM), Damien Dornic (CPPM)   report on behalf of the SVOM mission team:
 
We observed the field of the SVOM/ECLAIRs GRB 261011A (Huang et al., GCN 45895) with the LCO 1m telescope at Siding Spring Observatory equipped with the Sinistro instrument.
 
Our observation started on 2026-10-11 at 14:04:15.8 UT and we obtained 3x200 s exposures in the SDSS r and 3x200 s exposures in the Pan-STARRS z filters.
 
The optical counterpart (Cenko et al., GCN 45896, Neill et al., CGN 45897, Fu et al., GCN 45898, Izzo et al., GCN 45899, Wuet al., GCN 45900) is detected in our images. We measure the following magnitudes calibrated against the Pan-STARRS DR1 catalog, and not corrected for Galactic extinction:
 
r = 19.87 +/- 0.02 AB (mid-time 0.96 hr after the trigger);
z = 17.52 +/- 0.02 AB (mid-time 0.34 hr after the trigger).
 
This project is funded by the SVOM collaboration.