{
  "bibcode": "2018GCN.23252....1R",
  "body": "G.Ramsay (Armagh O.), K.Ulaczyk, D.Steeghs, J.Lyman (U. Warwick),\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\nThe Gravitational-wave Optical Transient Observer observed the field\nof the long GRB 180914B (Ursi et al. GCN Circ. 23226, Bissaldi et al. GCN\nCirc. 23232) from Roque de los Muchachos Observatory.\n\nIn a combined L-band image (400-700nm passband), with a total exposure\ntime of 600s at a mid-time 2018-09-16 21:57:04 UT, 2.149 days since\nburst, we detect the optical counterpart (Zheng et al. GCN\nCirc. 23237; Troja GCN Circ. 23238; de Ugarte Postigo et al. GCN\nCirc. 23239; Mazaeva et al. GCN Circ. 23244; Lipunov et al. GCN\nCirc. 23245) with a preliminary magnitude of g=20.9 +/- 0.2 based on a\ncomparison to Panstarrs g-band calibrators.\n\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)   (https://goto-observatory.org/)",
  "circularId": 23252,
  "createdOn": 1537222939000,
  "email": "D.T.H.Steeghs@warwick.ac.uk",
  "subject": "GRB 180914B: GOTO optical detection",
  "submitter": "Danny Steeghs at U.of Warwick/GOTO  <D.T.H.Steeghs@warwick.ac.uk>",
  "eventId": "GRB 180914B"
}