... Tonight's Sky . ... Observing . ... GRB theory questioned . ... The NASA Swift gamma-ray mission makes prompt multi-wavelength observations of gamma-ray bursts and their associated afterglows. ... Swift can turn and observe a gamma-ray burst with its X-ray and optical telescopes in just a few tens of seconds," says David Burrows from Pennsylvania State University, lead investigator for the X-ray telescope on Swift. ... Only registered members of Astronomy.com are allowed to comment on this article. ...