Background#
as a function of reconstructed energy and detector coordinates (BKG_3D)#
The Background3D
class represents a background rate per solid
angle as a function of reconstructed energy and detector coordinates
Its format specifications are available in BKG_3D.
This is the format in which IACT DL3 background rates are usually provided, as an example:
"""Plot the background rate from the HESS DL3 data release 1."""
import matplotlib.pyplot as plt
from gammapy.irf import Background3D
filename = "$GAMMAPY_DATA/hess-dl3-dr1/data/hess_dl3_dr1_obs_id_020136.fits.gz"
bkg = Background3D.read(filename, hdu="BKG")
bkg.peek()
plt.show()
as a function of reconstructed energy and offset angle, radially symmetric (BKG_2D)#
The Background2D
class represents a background rate per solid angle
as a function reconstructed energy and offset angle from the field of view center.
Its format specifications are available in BKG_2D.
You can produce a radially-symmetric background from a list of DL3 observations devoid of gamma-ray signal using the tutorial in background_model.html