TITLE: GCN CIRCULAR NUMBER: 10569 SUBJECT: Swift/BAT trigger 417974 (GRB100401A): Swift/XRT observations DATE: 10/04/03 00:55:02 GMT FROM: Valerio D'Elia at ASDC G. Stratta and V. D'Elia (ASDC) report on behalf of the Swift Team: Swift began a target of opportunity observation of GRB 100401A detected on ground (Cummings et al., GCN #10567) and by the Fermi/GBM (Goldstein and Gruber, GCN #10568), at 19:33:04 UT on April 2nd, 2010, approximately 36.4 hours after the Swift/BAT trigger. In about 2 ks of Photon Counting mode data, no X-ray source is detected inside the BAT error circle. This circular is an official product of the Swift-XRT team. ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program.