EnergyOffsetBackgroundModel

class gammapy.background.EnergyOffsetBackgroundModel(energy, offset, counts=None, livetime=None, bg_rate=None, counts_err=None, bg_rate_err=None)

Bases: object

EnergyOffsetArray background model.

Container class for EnergyOffsetArray background model (energy, offset). This class defines 3 EnergyOffsetArray of type EnergyOffsetArray

Parameters:

energy : EnergyBounds

energy bin vector

offset : Angle

offset bin vector

counts : ndarray, optional

data array (2D): store counts.

livetime : ndarray, optional

data array (2D): store livetime correction

bg_rate : ndarray, optional

data array (2D): store background model

counts_err : ndarray, optional

data array (2D): store errors on the counts.

bg_rate_err : ndarray, optional

data array (2D): store errors on the background model

Methods Summary

compute_rate()	Compute background rate cube from count_cube and livetime_cube.
fill_obs(obs_ids, data_store[, …])	Fill events and compute corresponding livetime.
from_table(table)	Create from Table.
read(filename)	Create from FITS file.
smooth()	Smooth the bkg rate with a gaussian 1D kernel.
to_table()	Convert to Table.
write(filename, **kwargs)	Write to FITS file.

Methods Documentation

compute_rate()

Compute background rate cube from count_cube and livetime_cube.

fill_obs(obs_ids, data_store, excluded_sources=None, fov_radius=<Angle 2.5 deg>)

Fill events and compute corresponding livetime.

Get data files corresponding to the observation list, histogram the counts and the livetime and fill the corresponding cube containers.

Parameters:

obs_ids : list

List of observation IDs

data_store : DataStore

Data store

excluded_sources : Table

Table of excluded sources. Required columns: RA, DEC, Radius

fov_radius : Angle

Field of view radius

classmethod from_table(table)

Create from Table.

classmethod read(filename)

Create from FITS file.

Parameters:

filename : str

File name

smooth()

Smooth the bkg rate with a gaussian 1D kernel.

Calling this method modifies the bg_rate data member, replacing it with a smoothed version.

This method uses an adaptive Poisson method to compute the smoothing Kernel width from the available counts (see code and inline comments for details).

to_table()

Convert to Table.

Returns:

table : Table

Table containing the EnergyOffsetBackgroundModel: counts, livetime and bg_rate

write(filename, **kwargs)

Write to FITS file.

Parameters:

filename : str

File name