{
  "bibcode": "2022GCN.32572....1D",
  "body": "S. de Wet (UCT), P.J. Groot (Radboud/UCT/SAAO) and D.A.H Buckley (SAAO)\nreport on behalf of the MeerLICHT consortium:\n\nFollowing the detection of GRB 220921A by Fermi/LAT (Pillera et al., GCN\n32568), the 0.6m wide-field MeerLICHT telescope, located at Sutherland,\nSouth Africa, obtained a repeated series of 60s exposures of a field\nencompassing the entire LAT error box in the q,u,g,r,i,z bands following\nthe sequence quqgqrqiqz. Observations started at 01:29:34 UT on September\n22 and continued for approximately two hours.\n\nWe detect the previously reported afterglow to GRB 220921A at a position\nconsistent with the MASTER and Swift/XRT positions (Lipunov et al., GCN\n32570; Kingler et al., GCN 32571) with the following AB magnitudes at a\nmid-time of September 22 01:46:00 UT, 0.61 days after the LAT trigger time:\n\nu = 19.28 +/- 0.14\ng = 18.64 +/- 0.03\nq = 18.47 +/- 0.02\nr = 18.43 +/- 0.04\ni = 18.25 +/- 0.05\nz = 18.24 +/- 0.11\n\nWe note that the source is exhibiting fading behaviour with respect to the\npreviously reported MASTER brightness (Lipunov et al., GCN 32570).\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 and the\nUniversity of Amsterdam.",
  "circularId": 32572,
  "createdOn": 1663840925000,
  "email": "dwtsim002@myuct.ac.za",
  "subject": "GRB 220921A: MeerLICHT afterglow observations",
  "submitter": "Simon de Wet at UCT  <dwtsim002@myuct.ac.za>",
  "eventId": "GRB 220921A"
}