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GCN Circular 41353

Subject
GRB 250813B: Ondrejov D50 optical afterglow detection
Event
GRB 250813B
Date
2025-08-14T00:09:05Z (12 days ago)
From
Martin Jelinek at Astro.Inst-AVCR,Ondrejov <martin.jelinek@asu.cas.cz>
Via
email
M. Jelinek, J. Strobl, F. Novotny, R. Hudec (ASU CAS Ondrejov)report:We observed the position of the SVOM-detected GRB 250813B (Xie et al., GCN 41352) with the D50 robotic telescope of the Astronomical Institute Ondrejov, near Prague, Czech Republic. We performed a series of 10s unfiltered exposuresstarting at 22:52:44.496 UT, i.e. 93.5s after the trigger.We detect the optical afterglow at 22:27:00.15 +12:27:44.5 (J2000), consistent with both the ECLAIRs localization (Xie et al., GCN 41352) and the refined MXTX-ray position. The source is clearly detected in single 10s unfiltered images.
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