{
  "bibcode": "2018GCN.23298....1U",
  "body": "K.Ulaczyk, D.Steeghs, J.Lyman (U. Warwick), G.Ramsay (Armagh O.),\nM.Dyer (U. Sheffield),  B.Gompertz, A.Levan, R.Cutter (U. Warwick)\nK. Ackley, D.Galloway, E.Rol (Monash U.), V.Dhillon (U. Sheffield),\nP.O'Brien, R.Starling (U. Leicester), S.Poshyachinda (NARIT),\nD.Pollacco (U. Warwick), E.Thrane (Monash U.), E.Palle (IAC)\n\nreport on behalf of the GOTO collaboration:\n\nIn response to GRB 181002A (Gropp et al. GCN 23290), the\nGravitational-wave Optical Transient Observer (GOTO) observed the\nfield near the Swift BAT/XRT detection.\n\nObservations started at 2018-10-03T01:19:02 UT (13.9 hours after the\nburst) consisting of a set of 3x5x120s exposures in our wide L filter\n(400-700nm). We do not detect any optical source within the error\ncircle of the enhanced XRT location (Beardmore et al. GCN 23292) with\na 5-sigma limit of g=20.8, using PanSTARRS calibrators on\nthe stacked image.\n\nWe note that our limits are deeper than those reported in Lipunov et al.\nGCN 23293 and Emery et al. GCN 23297, albeit obtained 13.9 hours\npost-burst.\n\nGOTO is operated at the La Palma observing facilities of the University\nof Warwick on behalf of a consortium including the University of\nWarwick, Monash University, Armagh Observatory, the University of\nLeicester, the University of Sheffield, the National Astronomical\nResearch Institute of Thailand (NARIT) and the Instituto de Astrofisica\nde Canarias (IAC)\n\nhttps://goto-observatory.org/",
  "circularId": 23298,
  "createdOn": 1538573691000,
  "email": "D.T.H.Steeghs@warwick.ac.uk",
  "subject": "GRB181002A: GOTO optical limits",
  "submitter": "Danny Steeghs at U.of Warwick/GOTO  <D.T.H.Steeghs@warwick.ac.uk>",
  "eventId": "GRB 181002A"
}