{
  "submittedHow": "web",
  "circularId": 40190,
  "format": "text/plain",
  "submitter": "A. Bochenek at Liverpool John Moores University <a.m.bochenek@2023.ljmu.ac.uk>",
  "bibcode": "2025GCN.40190....1B",
  "subject": "GRB 250419A: Liverpool Telescope observations",
  "createdOn": 1745230757041,
  "body": "A. Bochenek and D. A. Perley (LJMU) report:\n \nWe observed the SVOM-detected GRB250419a (Wang et al., GCN 40168) using the IO:O optical camera on the 2m robotic Liverpool Telescope. We obtained 6x100s exposures in the SDSS r’ and i’ filters starting at 2025-04-20 21:43:22 UT, approximately 1.80 days after the trigger.\n \nWe report a detection in both bands at the position of the optical counterpart (López et al., GCN 40169; Xin et al., GCN 40170; Zheng et al., GCN 40171; Kumar et al., GCN 40172; Thakur et al., GCN 40174; Lipunov et al., GCN 40179; Odeh et al., GCN 40180; Perley et al., GCN 40181; Pankov et al., GCN 40182; Pérez-Fournon GCN 40183; Kuin et al., GCN 40185; WU et al., GCN 40186; Xie et al., GCN 40187, Jiang et al., GCN 40188, Ghosh et al., GCN 40189). The obtained magnitudes are r = 20.61 ± 0.09 and i = 20.41 ± 0.08. The photometry was calibrated using nearby PanSTARRS secondary standards and was not corrected for extinction.\n\nMJD (mid)          T_mid-T_0        Filter       Mag. (AB)\n60785.90925        43.33 h            r          20.61 ± 0.09\n60785.91782        43.54 h            i          20.41 ± 0.08",
  "eventId": "GRB 250419A"
}