TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4987 SUBJECT: GRB(?)060421 : XRT position DATE: 06/04/21 09:05:47 GMT FROM: Michael Goad at U Leicester Mike Goad, Kim Page (U Leicester) report on behalf of the Swift XRT team : From a ground analysis of 436 seconds of PC mode data starting 98 seconds after the BAT trigger (trigger no. 206257) we detect a fading source at position RA 22 54 32.4, Dec +62 43 49.0 (J2000), with an estimated uncertainty of 4.1 arcseconds (90% containment). This circular is an official product of the Swift XRT team.