SingleObsCubeMaker

class gammapy.cube.SingleObsCubeMaker(obs, empty_cube_images, empty_exposure_cube, offset_band, exclusion_mask=None, save_bkg_scale=True)

Bases: object

Compute SkyCube images for one observation.

The computed cubes are stored in a SkyCube with the following name:

• counts_cube : Counts
• bkg_cube : Background model
• exposure_cube : Exposure
• excess_cube : Excess
• significance_cube : Significance

Parameters:

obs : DataStoreObservation

Observation data

empty_cube_images : SkyCube

Reference Cube for images in reco energy

empty_exposure_cube : SkyCube

Reference Cube for exposure in true energy

offset_band : Angle

Offset band selection

exclusion_mask : SkyCube

Exclusion mask

save_bkg_scale: bool

True if you want to save the normalisation of the bkg computed outside the exclusion region in a Table

Methods Summary

background_norm_factor()	Determine background scaling factor.
make_bkg_cube([bkg_norm])	Make the background image for one observation from a bkg model.
make_counts_cube()	Fill the counts cube for the events of one observation.
make_excess_cube()	Compute excess cube between counts and bkg cubes.
make_exposure_cube()	Compute the exposure cube.
make_significance_cube(radius)	Make the significance cube from the counts and bkg cubes.

Methods Documentation

background_norm_factor()

Determine background scaling factor.

Compares the events in the counts cube and the bkg cube outside the exclusion regions.

Returns:

scale : float

scaling factor between the counts and the bkg images outside the exclusion region.

make_bkg_cube(bkg_norm=True)

Make the background image for one observation from a bkg model.

Parameters:

bkg_norm : bool

If true, apply the scaling factor from the number of counts outside the exclusion region to the bkg image

make_counts_cube()

Fill the counts cube for the events of one observation.

make_excess_cube()

Compute excess cube between counts and bkg cubes.

make_exposure_cube()

Compute the exposure cube.

make_significance_cube(radius)

Make the significance cube from the counts and bkg cubes.

Parameters:

radius : float

Disk radius in pixels.