make_spectrum.py
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#! /usr/bin/env python
# ==========================================================================
# Makes spectrum and optionally plot it
#
# Copyright (C) 2014-2016 Juergen Knoedlseder
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# ==========================================================================
import sys
import ctools
import cscripts
try:
import matplotlib.pyplot as plt
plt.figure()
plt.close()
except (ImportError, RuntimeError):
print('This script needs the "matplotlib" module')
sys.exit()
# =============== #
# Create spectrum #
# =============== #
def create_spectrum(datadir):
"""
Simulate events and generate a source spectrum
Returns
-------
datadir : str
Data directory
"""
# Set script parameters
model_name = datadir+'/crab.xml'
caldb = 'prod2'
irf = 'South_0.5h'
ra = 83.63
dec = 22.01
rad_sim = 3.0
tstart = 0.0
tstop = 1800.0
emin = 0.1
emax = 100.0
enumbins = 10
# Simulate events
sim = ctools.ctobssim()
sim['inmodel'] = model_name
sim['caldb'] = caldb
sim['irf'] = irf
sim['ra'] = ra
sim['dec'] = dec
sim['rad'] = rad_sim
sim['tmin'] = tstart
sim['tmax'] = tstop
sim['emin'] = emin
sim['emax'] = emax
sim.run()
# Create spectrum
spec = cscripts.csspec(sim.obs())
spec['srcname'] = 'Crab'
spec['outfile'] = 'example_spectrum.fits'
spec['expcube'] = 'NONE'
spec['psfcube'] = 'NONE'
spec['bkgcube'] = 'NONE'
spec['edisp'] = False
spec['emin'] = emin
spec['emax'] = emax
spec['enumbins'] = enumbins
spec['ebinalg'] = 'LOG'
spec.run()
spec.save()
# Get copy of spectrum
spectrum = spec.spectrum().copy()
# Return
return spectrum
# ============= #
# Plot spectrum #
# ============= #
def plot_spectrum(spectrum, plotfile):
"""
Plot spectrum
Parameters
----------
spectrum : `~gammalib.GFits`
Spectrum FITS file
plotfile : str
Plot filename
"""
# Extract columns from spectrum file
table = spectrum.table(1)
c_energy = table['Energy']
c_ed = table['ed_Energy']
c_eu = table['eu_Energy']
c_flux = table['Flux']
c_eflux = table['e_Flux']
c_ts = table['TS']
c_upper = table['UpperLimit']
# Initialise arrays to be filled
energies = []
flux = []
ed_engs = []
eu_engs = []
e_flux = []
ul_energies = []
ul_ed_engs = []
ul_eu_engs = []
ul_flux = []
# Loop over rows of the file
nrows = table.nrows()
for row in range(nrows):
# Get TS
ts = c_ts.real(row)
flx = c_flux.real(row)
e_flx = c_eflux.real(row)
# Switch
if ts > 9.0 and e_flx < flx:
# Add information
energies.append(c_energy.real(row))
flux.append(c_flux.real(row))
ed_engs.append(c_ed.real(row))
eu_engs.append(c_eu.real(row))
e_flux.append(c_eflux.real(row))
#
else:
# Add information
ul_energies.append(c_energy.real(row))
ul_flux.append(c_upper.real(row))
ul_ed_engs.append(c_ed.real(row))
ul_eu_engs.append(c_eu.real(row))
# Create figure
plt.figure()
plt.title('Crab spectrum')
# Plot the spectrum
plt.loglog()
plt.grid()
plt.errorbar(energies, flux, yerr=e_flux, xerr=[ed_engs, eu_engs],
fmt='ro')
plt.errorbar(ul_energies, ul_flux, xerr=[ul_ed_engs, ul_eu_engs],
yerr=1.0e-11, uplims=True, fmt='ro')
plt.xlabel('Energy (TeV)')
plt.ylabel(r'E$^{2}$dN/dE (erg cm$^{-2}$ s$^{-1}$)')
# Show spectrum or save it into file
if len(plotfile) > 0:
plt.savefig(plotfile)
else:
plt.show()
# Return
return
# ============= #
# Make spectrum #
# ============= #
def make_spectrum():
"""
Make spectrum
"""
# Set usage string
usage = 'make_spectrum.py [-d datadir] [-p plotfile]'
# Set default options
options = [{'option': '-d', 'value': 'data'},
{'option': '-p', 'value': ''}]
# Get arguments and options from command line arguments
args, options = cscripts.ioutils.get_args_options(options, usage)
# Extract script parameters from options
datadir = options[0]['value']
plotfile = options[1]['value']
# Generate spectrum
spectrum = create_spectrum(datadir)
# Plot spectrum
plot_spectrum(spectrum, plotfile)
# Return
return
# ======================== #
# Main routine entry point #
# ======================== #
if __name__ == '__main__':
# Make spectrum
make_spectrum()