{
  "eventId": "GRB 250818B",
  "submitter": "Dimple  at University of Birmingham <dimplepanchal96@gmail.com>",
  "subject": "GRB 250818B: Liverpool Telescope optical detections",
  "format": "text/plain",
  "createdOn": 1755689444615,
  "body": "Dimple (U. Birmingham), B. P. Gompertz (U. Birmingham), and A. Kumar (RHUL) report on behalf of a larger collaboration:\n\nWe conducted follow-up observations of GRB 250818B (Wang et al., GCN Circ. 41405) with the IO:O camera on the 2m robotic Liverpool Telescope (LT). Observations began at 03:46:39 UT on 2025-08-20, ~2 days after the SVOM/ECLAIRs trigger, and consisted of 5 x 240 s exposures in each of the SDSS g, r, i, and z filters.\n\nWe detect the optical afterglow (Kumar et al., GCN Circ. 41406; Yao et al., GCN Circ. 41409; Zheng et al., GCN Circ. 41417; Bendtsen et al., GCN Circ. 41426; Moskvitin et al., GCN Circ. 41428; An et al., GCN Circ. 41430; Kumar et al., GCN Circ. 41431) in all filters, and measure an AB magnitude of r = 22.14 ± 0.10 (mid-time t0+2.03 days).\n\nMagnitudes are calibrated against nearby Pan-STARRS stars and are not corrected for Galactic extinction.\n",
  "submittedHow": "web",
  "bibcode": "2025GCN.41442....1D",
  "circularId": 41442
}