TITLE: GCN CIRCULAR NUMBER: 28171 SUBJECT: GRB 200729A: Spitzer archival source detection DATE: 20/07/30 00:50:11 GMT FROM: Tanmoy Laskar at U of Bath T. Laskar (U. of Bath), E. Berger (Harvard), C. Kilpatrick (UCSC), W. Fong, R. Margutti, R. Chornock, A. Hajela, K. Alexander, D. Coppejans (Northwestern) report: "In an archival observation of NGC4242 by the Spitzer Space Telescope on 2012-08-06 (PI: van Zee), we find a point-like source coincident with the enhanced X-ray position of GRB 200729A (Osborne et al, GCN 28168). Photometry is complicated by the variable background; preliminary analysis suggests the object has a flux density of ~ 11 uJy (21.3 AB mag), about 1 mag brighter than the NOT r/z limits (Malesani et al., GCN 28169). Further analysis is in progress."