{
  "bibcode": "2021GCN.30498....1D",
  "body": "S. de Wet (UCT), P.J. Groot (Radboud/UCT/SAAO), A.J. Levan (Radboud),\nP.M. Vreeswijk (Radboud), report on behalf of the MeerLICHT consortium:\n\nFollowing the detection of GRB210724A by Swift and its X-ray\ncounterpart (D'Avanzo et al., GCN30497), the 0.6m MeerLICHT telescope,\nlocated at Sutherland, South Africa obtained a repeating series of\n60s images in the q,u,q,g,q,r,q,i,q,z bands. Observations began at\n2021-07-24, 20:25:18.02 UT, 11 minutes after the Swift detection,\nand 2 minutes after the distribution of the BAT alert, and continued\nuntill 21:27:36 UT.\n\nWe detect no optical afterglow at the XRT position (D�Avanzo et al.\nGCN30497) in our first u,g,q,r,i,z exposures to 5-sigma limiting\nmagnitudes of:\n\nu > 18.59 at 20:27:37 UT\ng > 19.40 at 20:31:01 UT\nq > 19.77 at 20:25:49 UT\nr > 19.38 at 20:34:31 UT\ni > 19.26 at 20:37:45 UT\nz > 18.14 at 20:59:12 UT\n\nFull moon conditions limited the depth of our exposures.\n\nWe do note that an r=21.5 object is visible within the XRT localisation\nin PanSTARRS imaging of the field, and is a plausible host galaxy.\n\nMeerLICHT is built and run by a consortium consisting of Radboud\nUniversity, University of Cape Town, the South African Astronomical\nObservatory, the University of Oxford, the University of Manchester\nand the University of Amsterdam.\nDisclaimer - University of Cape Town This email is subject to UCT policies and email disclaimer published on our website at http://www.uct.ac.za/main/email-disclaimer or obtainable from +27 21 650 9111. If this email is not related to the business of UCT, it is sent by the sender in an individual capacity. Please report security incidents or abuse via https://csirt.uct.ac.za/page/report-an-incident.php.",
  "circularId": 30498,
  "createdOn": 1627167374000,
  "email": "dwtsim002@myuct.ac.za",
  "subject": "GRB210724A: MeerLICHT upper limits",
  "submitter": "Simon de Wet at University of Cape Town  <dwtsim002@myuct.ac.za>",
  "eventId": "GRB 210724A"
}