{
  "eventId": "GRB 260903A",
  "circularId": 45516,
  "body": "A. Bochenek, D. A. Perley (LJMU), report:\n\nWe observed the field of GRB 260903A (Brunet et al., GCN 45499) using the IO:O optical camera on the 2m robotic Liverpool Telescope. We obtained 6x120s exposures in SDSS gz filters and 12x120s in the SDSS r filter, starting at 2026-09-04 00:42:48 UT, approximately 12 hours after SVOM/ECLAIRS trigger. \n\nThe obtained images were stacked after discarding bad quality exposures. We detect a source in the r-band stack at a counterpart position reported by Li et al. (GCN 45504), Saccardi et al. (GCN 45505), Malesani et al. (GCN 45508), Russeil et al. (GCN 45509), Li et al. (GCN 45510), and Moskvitin et al. (GCN 45115). We also report 3-sigma upper limits in other bands.\n\nMJD (mid)         T_mid-T_0        Filter       Mag. (AB)\n61287.03369        12.2 h           g            > 22.37\n61287.04889        12.6 h           r         22.73 ± 0.26\n61287.06252        12.9 h           z            > 21.38\n\nThe photometry is in the AB magnitude system, was calibrated using nearby PanSTARRS secondary standards and was not corrected for extinction.",
  "subject": "GRB260903A: Liverpool Telescope optical observations",
  "createdOn": 1788539954190,
  "submittedHow": "web",
  "format": "text/plain",
  "submitter": "A. Bochenek at Liverpool John Moores University <a.m.bochenek@2023.ljmu.ac.uk>",
  "eventType": [
    "GRB",
    "Optical Transient"
  ]
}