TITLE: GCN CIRCULAR NUMBER: 10559 SUBJECT: INTEGRAL trigger 5994 (GRB100331A): Swift/XRT observations DATE: 10/03/31 23:33:37 GMT FROM: Valerio D'Elia at INAF-OAR G. Stratta, V. D'Elia, M. Perri (ASDC) report on behalf of the Swift Team: Swift began a target of opportunity observation of the INTEGRAL detected GRB 100331A (Mereghetti et al., GCN #10555), at 14:29UT on March 31st, 2010, approximately 14 hours after the INTEGRAL detection. In 1890 s of Photon Counting mode data, no X-ray source is detected inside the INTEGRAL error cirlce. This circular is an official product of the Swift-XRT team. ------------------------------------------------- This mail sent through IMP: http://horde.org/imp/