{
  "submitter": "Ben Gompertz at U of Birmingham <b.gompertz@bham.ac.uk>",
  "createdOn": 1749732872064,
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Ben Gompertz at U of Birmingham <b.gompertz@bham.ac.uk>",
  "format": "text/plain",
  "circularId": 40699,
  "subject": "GRB 250610B: Liverpool Telescope continued monitoring",
  "editedOn": 1749735544277,
  "submittedHow": "email",
  "version": 2,
  "body": "B. P. Gompertz (U. Birmingham), Dimple (U. Birmingham) and A. Bochenek (LJMU) report on behalf of a larger collaboration:\n\nWe 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.\n\nWe 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; Adami et al., GCN 40698) 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).\n\nMagnitudes are calibrated against nearby Pan-STARRS stars and are not corrected for Galactic extinction.\n\n",
  "eventId": "GRB 250610B",
  "bibcode": "2025GCN.40699....1G"
}