{
  "bibcode": "2019GCN.24432....1U",
  "body": "K.Ulaczyk(1), J.Lyman(1), D.Steeghs(1), D.Galloway(2)\nK.Ackley(2), A.Obradovic(2), Y-L.Mong(2),\nM.Dyer(3), V.Dhillon(3), P.O'Brien(4), G.Ramsay(5),\nD.Pollacco(1), E.Thrane(2), S.Poshyachinda(6),\nE.Palle(7), K.Wiersema(1), R.Cutter(1), A.Levan(1),\nT. Marsh(1), R.West(1), B.Gompertz(1), E.Stanway(1),\nA.Casey(2), M.Brown(2), E.Rol(2), J.Mullaney(3),\nS.Littlefair(3), L.Makrygianni(3), E.Daw(3), J.Maund(3),\nR.Starling(4), R.Eyles(4), S.Tooke(4), U.Sawangwit(6),\nD.Mkrtichian(6), S.Awiphan(6), S.Aukkaravittayapun(6),\nP.Irawati(6), M.Kennedy(8), R.Breton(8), D.Mata-Sanchez(8),\nT.Heikkila(9), R.Kotak(9)\n(1) Warwick University; (2) Monash University; (3) Univ. of Sheffield;\n(4) University of Leicester; (5) Armagh Observatory & Planetarium;\n(6) National Astronomical Research Institute of Thailand;\n(7) Instituto de Astrofisica de Canarias; (8) Univ. of Manchester;\n(9) University of Turku\n\nreport on behalf of the GOTO collaboration:\n\nWe carried out observations with the Gravitational-wave Optical\nTransient Observer (GOTO), in response to the Fermi trigger 579036175\n(GRB 190508A; GCN #24427).\n\nWe made a series of 3 x 60 s exposures using our wide L-band filter\n(400-700 nm) with five pointings covering 75.9% of the estimated sky\nprobability region. Two independent sky passes started on 2019 May 8\n21:04 UT (1.68 hrs post-burst) and 2019 May 9 1:12 UT.\n\nUsing a difference imaging analysis with recent survey observations\nof the same pointings as reference, we identify no viable\ncounterparts. Our mean 5-sigma detection limit was g=20.6 mag based\non PS1 catalogue calibrators.\n\n\nGOTO is operated at the La Palma observing facilities of the\nUniversity of Warwick on behalf of a consortium including the\nUniversity of Warwick, Monash University, Armagh Observatory, the\nUniversity of Leicester, the University of Sheffield, the National\nAstronomical Research Institute of Thailand (NARIT) and the Instituto\nde Astrofisica de Canarias (IAC) (https://goto-observatory.org)",
  "circularId": 24432,
  "createdOn": 1557409473000,
  "email": "dsteeghs@gmail.com",
  "subject": "GRB 190508A: GOTO optical search - no counterparts",
  "submitter": "Danny Steeghs at U.of Warwick/GOTO  <dsteeghs@gmail.com>",
  "eventId": "GRB 190508A"
}