The FITS file has the following BinTable HDUs / columns:
- PSF HDU
- Energy -- 1D (MeV)
- Exposure -- 1D (cm^2 s)
- Psf -- 2D (sr^-1), shape = (len(Energy) x len(Theta)) Point spread function value dP/dΩ, see
psf-pdf.
- THETA HDU
- Theta -- 1D (deg)
Header keywords:
As explained in hduclass, the following header keyword should be used to declare the type of HDU:
HDUDOC= 'https://github.com/open-gamma-ray-astro/gamma-astro-data-formats'HDUVERS= '0.3'HDUCLASS= 'GADF'HDUCLAS1= 'RESPONSE'HDUCLAS2= 'PSF'HDUCLAS3= 'FULL-ENCLOSURE'HDUCLAS4= 'GTPSF'
Example data file: psf-fermi.fits