  The Advanced LIGO observatory recently reported the first direct detection of
gravitational waves (GW) which triggered ALIGO on 2015 September 14. We report
on observations taken with the Swift satellite two days after the trigger. No
new X-ray, optical, UV or hard X-ray sources were detected in our observations,
which were focussed on nearby galaxies in the GW error region and covered 4.7
square degrees (~2% of the probability in the rapidly-available GW error
region; 0.3% of the probability from the final GW error region, which was
produced several months after the trigger). We describe the rapid Swift
response and automated analysis of the X-ray telescope and UV/Optical Telescope
data, and note the importance to electromagnetic follow up of early
notification of the progenitor details inferred from GW analysis.
