Energy dispersion format

The format to store full-enclosure energy dispersion (see Energy Dispersion) is the following:

EDISP_2D

The energy dispersion information is saved as a BINTABLE HDU with the following required columns.

Columns:

• ENERG_LO, ENERG_HI – ndim: 1, unit: TeV

  • True energy axis

• MIGRA_LO, MIGRA_HI – ndim: 1, unit: dimensionless

  • Energy migration axis (defined above)

• THETA_LO, THETA_HI – ndim: 1, unit: deg

  • Field of view offset axis (see Field of view)

• MATRIX – ndim: 3, unit: dimensionless

  • Energy dispersion \(dP/d\mu\), see Energy Dispersion.

Recommended axis order: ENERGY, MIGRA, THETA

Header keywords:

As explained in HDU classes, 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 = ‘0.2’
• HDUCLASS = ‘GADF’
• HDUCLAS1 = ‘RESPONSE’
• HDUCLAS2 = ‘EDISP’
• HDUCLAS3 = ‘FULL-ENCLOSURE’
• HDUCLAS4 = ‘EDISP_2D’

Example data file: TODO