{
  "bibcode": "2025GCN.40020....1P",
  "eventId": "GRB 250402A",
  "submittedHow": "web",
  "body": "I. Pérez-Fournon, F. Poidevin (IAC and ULL), D. Cano-Morales, A.E. Hernández-Díaz, I. Correa-Plasencia (ULL), and A. López-Oramas (IAC and ULL) \n\nWe report Las Cumbres Observatory Global Telescope network (LCOGT) observations of the SVOM GRB 250402A (Chen et al., GCN circ. 40014; Maggi et al., GCN circ. 40019). We observed the field of GRB 250402A with the three LCOGT 1-m telescopes, equipped with Sinistro cameras, located at the LCOGT node at Cerro Tololo Inter-American Observatory (Chile) in the SDSS r, g, and i filters, starting at 2025-04-03 02:58:50 UTC, about 3.85 hours after the SVOM trigger.\n\nAn uncatalogued source is clearly detected in the three filters at the position of the optical counterpart detected by SVOM/VT (Xin et al., GCN circ. 40015).\n\nWe measure the following magnitudes, calibrated against Pan-STARRS DR2 stars and not corrected for Galactic extinction:\n\n\nDate       |  UT start |  mag  | error | filter | exposure time (sec)\n---------------------------------------------------------------------\n2025-04-03   02:58:50    21.01   0.14      r             300\n2025-04-03   03:15:44    21.91   0.17      g             300\n2025-04-03   03:21:06    20.80   0.13      i             300\n\nThis work makes use of observations from the Las Cumbres Observatory global telescope network (LCOGT observing programme IAC2025A-009, SGLF).\n\n\n",
  "createdOn": 1743671395536,
  "submitter": "Ismael Perez-Fournon at Instituto de Astrofisica de Canarias <ipf@iac.es>",
  "circularId": 40020,
  "format": "text/plain",
  "subject": "GRB 250402A: LCO optical counterpart detection"
}