What is the conversion from detector coordinates to sky coordinates?
(10/28/91)
For the HRI, the conversion is essentially a rotation by the roll angle. The pipeline software 'flips' the image about the y-axis twice during processing. Note that this definition differs from that of the PSPC. This difference will be a problem only for those who wish to compare an HRI image, in detector coordinates, with a PSPC image in detector coordinates.
Select another question related to this topic
Select another FAQ topic Return to the ROSAT GOF
Please use the Feedback link if you have questions on ROSAT.