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GCN Circular 42062

Subject
GRB 251002A: LCO optical observation
Event
GRB 251002A
Date
2025-10-02T21:05:15Z (6 days ago)
From
SVOM_group <svomgroup@bao.ac.cn>
Via
Web form
D. Turpin (CEA/Irfu), A. Saccardi (CEA/Irfu), D. Gotz (CEA/Irfu), B. Cordier (CEA/Irfu), L. P. Xin (NAOC), C. Wu (NAOC), report on behalf of the SVOM mission team:

We observed the field of GRB 251002A (Saccardi et al. GCN 42060) with the LCO 1m telescope at South African Astronomical Observatory equipped with the Sinistro instrument. Our observation started at 2025-10-02T20:34:02.740 about 19 min after the SVOM/ECLAIRs T0 time.

We obtained 3x200 s exposures in the SDSS r filter. The optical counterpart reported by Palmerio et al. (GCN 42061) is clearly detected in our first image subtracted to the Pan-STARRS DR2 catalog image.
We measure the following magnitude:

r = 17.55 +/- 0.03 (AB), at a mid-time of 20.8 min after the trigger.

Further observations are planned.
This project is funded by the SVOM collaboration.
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