720 XTF Search Results (f1-spectral-Type=Gamma ray;f2-type=Collage);f2-type%3DCollage Results for your query: f1-spectral-Type=Gamma ray;f2-type=Collage Thu, 01 Jan 1970 12:00:00 GMT GRB 090423. One for the record books, gamma-ray burst 090423 was detected April 23, 2009, by the Swift Gamma-Ray Burst Explorer mission. The image is a composite of data from UVOT and XRT. The image is fuzzy because XRT does not have high enough resolution to produce sharp images. Thu, 23 Apr 2009 12:00:00 GMT