{
  "bibcode": "2020GCN.26853....1W",
  "body": "K.Wiersema (1); D.Steeghs (1); K.Ulaczyk (1); J.Lyman (1); R.Cutter\n(1); T.Killestein (1); M.Dyer (3); M.Kennedy (10); G.Ramsay (5);\nD.K.Galloway (2); V.Dhillon (3); P.O���Brien (4); D.Pollacco (1);\nE.Thrane (2); S.Poshyachinda (6); S.Mattila (7); L.Nuttall (8);\nE.Palle (9); A.Levan (1); T.Marsh (1); R.West (1); E.Stanway (1);\nB.Gompertz (1); J.McCormac (1); P.Strom (1); K.Ackley (2);\nY.-L.Mong (2); A.Casey (2); M.Brown (2); B.Muller (2);\nJ.Mullaney (3); E.Daw (3); S.Littlefair (3); J.Maund (3);\nL.Makrygianni (3); R.Starling (4); R.Eyles (4); S.Tooke (4);\nS.Aukkaravittayapun (6); U.Sawangwit (6); S.Awiphan (6);\nD.Mkrtichian (6); P.Irawati (6); R.Kotak (7); T.Heikkila (7); E.Rol\n(2)\n(1) Warwick University, (2) Monash University, (3) University of\nSheffield, (4) University of Leicester, (5) Armagh Observatory &\nPlanetarium, (6) National Astronomical Research Institute of\nThailand, (7) University of Turku, (8) University of Portsmouth, (9)\nInstituto de Astrofisica de Canarias), (10) Univ. of Manchester.\n\nreport on behalf of the GOTO collaboration:\n\nWe carried out observations with the Gravitational-wave Optical\nTransient Observer (GOTO), in response to GRB 200122A\n(Sonbas et al. 2020; GCN #26844).\n\nWe made a series of 3 x 60 s exposures using our wide L-band filter\n(400-700 nm) covering the Swift XRT position RA, Dec = 210.01807,\n+27.54884 (Osborne et al. 2020; GCN #26846), with midtime 02:35:49\nUT on 22 January 2020 (3289 seconds after trigger).\n\nUsing a difference imaging analysis with recent survey observations\nof the same pointings as reference, we identify no viable\nafterglow candidate. Our 5-sigma detection limit was g=19.5 mag\nbased on PS1 catalogue calibrators.\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": 26853,
  "createdOn": 1579699885000,
  "email": "j.d.lyman@warwick.ac.uk",
  "subject": "GRB 200122A: GOTO non-detection of optical afterglow",
  "submitter": "Joe Lyman at U of Warwick  <j.d.lyman@warwick.ac.uk>",
  "eventId": "GRB 200122A"
}