{
  "bibcode": "2021GCN.30193....1M",
  "body": "Y-L Mong (1); K. Wiersema (2); R. Starling (3); K. Ackley (1);\nM. Dyer (4); D. K. Galloway (1); J. Lyman (2); K. Ulaczyk (2);\nD. Steeghs (2); V. Dhillon (4); P. O'Brien (3); G. Ramsay (5);\nS. Poshyachinda (6); R. Kotak (7); L. Nuttall (8); D. Pollacco (2);\nR. Breton (9)\n\n((1) Monash University, (2) Warwick University, (3) University of\nLeicester, (4) University of Sheffield, (5) Armagh Observatory &\nPlanetarium, (6) National Astronomical Research Institute of Thailand, (7)\nUniversity of Turku, (8) University of Portsmouth, (9) University of\nManchester) report on behalf of the GOTO collaboration:\n\nWe carried out observations with the Gravitational-wave Optical\nTransient Observer (GOTO) on La Palma in response to GRB 210610B (Page\net al; GCN 30170). We detect an uncatalogued source consistent with\nthe OT reported by Swift UVOT (Page et al.; GCN 30170) and other\nfacilities.\n\nWe made a series of 4x90 s exposures using our wide L-band\nfilter(400-700 nm) beginning around ~4hrs after the trigger, with\nmidtime of the first observation 23:50:18.136 UT on 10 June 2021.\n\nWe detect an uncatalogued source located at (J2000):\n\nRA 16:15:40.369Dec +14:23:57.19\n\nconfirming the OT (Page et al.; GCN 30170, Kumar et al.;\nGCN 30174, Rumyantsev et al.; GCN 30175, 30178, Hu et al.;\nGCN 30177, de Wet et al.; GCN 30180, Romanov; GCN 30181,\nFynbo et al.; GCN 30182, Moskvitin et al.; GCN 30187, Osborne\nEt al.; GCN 30189, Becerra et al.; GCN 30190).\n\nWe find an equivalent magnitude of g = (17.86 +/- 0.05) mag based\non calibration against PanSTARRS DR1 photometry in ATLAS_REFCAT2\n(Tonry et al. 2018).\n\nObservations are continuing.\n\nGOTO is operated at the La Palma observing facilities of the\nUniversityof Warwick on behalf of a consortium including the\nUniversity ofWarwick, Monash University, Armagh Observatory, the\nUniversity ofLeicester, the University of Sheffield, the National\nAstronomicalResearch Institute of Thailand (NARIT), Turku University,\nPortsmouth\nUniversity, Manchester University and the Instituto de Astrofisicade\nCanarias (IAC) (https://goto-observatory.org)",
  "circularId": 30193,
  "createdOn": 1623399392000,
  "email": "yik.mong@monash.edu",
  "subject": "GRB 210610B: GOTO confirmation of afterglow detection",
  "submitter": "Travis Mong at Monash University  <yik.mong@monash.edu>",
  "eventId": "GRB 210610B"
}