{
  "body": "Paul Kuin (MSSL/UCL) reports on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began observations of the field of SVOM detected GRB\n250502A 72ks after the SVOM ECLAIR trigger (Wang et al., GCN Circ.\n40313).\nA source consistent with the position reported by Ny Avo\nRakotondraine et al. (GCN Circ. 40315)  has been\ndetected in the initial UVOT exposures.\n\nThe detections using the UVOT photometric system (Breeveld et al.\n2011, AIP Conf. Proc. 1358, 373) for the early exposures are:\n\nFilter         T_start  T_stop      Exp(s)         Mag (Vega)\n\nWh             78ks     95ks      880            21.5+/- 0.35\nu              72ks    106ks     3664            >21.3 (3-sigma UL)\n",
  "createdOn": 1746388981065,
  "submitter": "Paul Kuin at MSSL <npkuin@gmail.com>",
  "circularId": 40340,
  "bibcode": "2025GCN.40340....1K",
  "submittedHow": "email",
  "eventId": "GRB 250502A",
  "subject": "GRB 250502A: Swift/UVOT Follow up"
}