TITLE: GCN CIRCULAR NUMBER: 32572 SUBJECT: GRB 220921A: MeerLICHT afterglow observations DATE: 22/09/22 10:02:05 GMT FROM: Simon de Wet at UCT S. de Wet (UCT), P.J. Groot (Radboud/UCT/SAAO) and D.A.H Buckley (SAAO) report on behalf of the MeerLICHT consortium: Following the detection of GRB 220921A by Fermi/LAT (Pillera et al., GCN 32568), the 0.6m wide-field MeerLICHT telescope, located at Sutherland, South Africa, obtained a repeated series of 60s exposures of a field encompassing the entire LAT error box in the q,u,g,r,i,z bands following the sequence quqgqrqiqz. Observations started at 01:29:34 UT on September 22 and continued for approximately two hours. We detect the previously reported afterglow to GRB 220921A at a position consistent with the MASTER and Swift/XRT positions (Lipunov et al., GCN 32570; Kingler et al., GCN 32571) with the following AB magnitudes at a mid-time of September 22 01:46:00 UT, 0.61 days after the LAT trigger time: u = 19.28 +/- 0.14 g = 18.64 +/- 0.03 q = 18.47 +/- 0.02 r = 18.43 +/- 0.04 i = 18.25 +/- 0.05 z = 18.24 +/- 0.11 We note that the source is exhibiting fading behaviour with respect to the previously reported MASTER brightness (Lipunov et al., GCN 32570). MeerLICHT is built and run by a consortium consisting of Radboud University, University of Cape Town, the South African Astronomical Observatory, the University of Oxford, the University of Manchester and the University of Amsterdam.