{
  "eventId": "GRB 251002A",
  "circularId": 42099,
  "submittedHow": "web",
  "createdOn": 1759515986929,
  "body": "S.P.R. Shilling (Lancaster U.) reports on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 251002A in the U band for a total of 1.5 ks, starting 3.6 ks after the SVOM/ECLAIRs trigger (Saccardi et al., GCN Circ. 42060).\n\nA source is detected in the U band at a position that is consistent with other detections by other instruments in the optical (Palmerio et al., GCN 42061; Turpin et al., GCN 42062; Jelinek et al., GCN 42063; Julia-Maroto et al., GCN 42064; Moskvitin et al., GCN 42065; Perez-Garcia et al., GCN 42606; Senik et al., GCN 42067; Saccardi et al., GCN 42076; Mandarakas et al., GCN 42077; Cao et al., GCN 42078; Schneider et al., GCN 42080; Pankov et al., GCN 42081; Leonini et al., GCN 42082; Odeh et al., GCN 42087; Wortley et al., GCN 42091).\n\nPreliminary detections using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the stacked U band images are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)           Mag\n\nU\t             3628        9263        1476           19.02 +/- 0.08\n\nThe magnitude reported here is not corrected for Galactic extinction.\n",
  "format": "text/plain",
  "subject": "GRB 251002A: Swift/UVOT detection",
  "submitter": "s.shilling@lancaster.ac.uk",
  "bibcode": "2025GCN.42099....1S"
}