TITLE: GCN CIRCULAR NUMBER: 40699 SUBJECT: GRB 250610B: Liverpool Telescope continued monitoring DATE: 25/06/12 12:54:32 GMT FROM: Ben Gompertz at U of Birmingham b.gompertz@bham.ac.uk
B. P. Gompertz (U. Birmingham), Dimple (U. Birmingham) and A. Bochenek (LJMU) report on behalf of a larger collaboration:
We continued follow-up observations of GRB 250610B (Saccardi et al., GCN 40671) for a second night with the IO:O camera on the 2m robotic Liverpool Telescope (LT). Observations began at 21:56:59 UT on 2025-06-11, ~29.4 hr after the SVOM/ECLAIRs trigger, and consisted of 8x180 s exposures in the SDSS r and i filters.
We detect the optical counterpart (Schneider et al., GCN 40676; Gompertz et al., GCN 40677; Li et al., GCN 40678; Bochenek & Perley, GCN 40684; Qiu et al., GCN 40685; Schneider et al., GCN 40689; Breeveld & Williams, GCN 40691) with AB magnitudes of r = 22.38 ± 0.13 (mid-time t0+1.23 days) and i = 22.13 ± 0.08 (mid-time t0+1.25 days).
Magnitudes are calibrated against nearby Pan-STARRS stars and are not corrected for Galactic extinction.
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