pipeline_binned_disk.py
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#! /usr/bin/env python
# ==========================================================================
# This script illustrates how to perform a binned CTA analysis based on
# simulated CTA data. You may use and adapt this script to implement your
# own pipeline.
#
# Usage:
# ./pipeline_binned_disk.py
#
# ==========================================================================
#
# Copyright (C) 2015 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 gammalib
import ctools
from cscripts import obsutils
# ================== #
# Setup observations #
# ================== #
def setup_observations(pattern="four", ra=83.63, dec=22.01, offset=1.5,
emin=0.1, emax=100.0, rad=5.0, duration=1800.0,
deadc=0.95,
caldb="prod2", irf="South_50h"):
"""
Returns an observation container.
Keywords:
pattern - Pointing pattern, either "single" or "four"
ra - RA of pattern centre [deg] (default: 83.6331)
dec - DEC of pattern centre [deg] (default: 22.0145)
offset - Offset between observations of pattern [deg] (default: 1.5)
emin - Minimum energy [TeV] (default: 0.1)
emax - Maximum energy [TeV] (default: 100.0)
rad - ROI radius used for analysis [deg] (default: 5.0)
duration - Duration of one CTA observation [seconds] (default: 1800.0)
deadc - Deadtime correction factor (default: 0.95)
caldb - Calibration database path (default: "dummy")
irf - Instrument response function (default: cta_dummy_irf)
"""
# Set list of observations
obs_def_list = obsutils.set_obs_patterns(pattern,
ra=ra,
dec=dec,
offset=offset)
# Get observation container
obs = obsutils.set_obs_list(obs_def_list,
duration=duration,
emin=emin,
emax=emax,
rad=rad,
caldb=caldb,
irf=irf)
# Return observation container
return obs
# =========== #
# Setup model #
# =========== #
def setup_model(obs, model="${CTOOLS}/share/models/crab.xml"):
"""
Setup model for analysis.
Keywords:
model - Model Xml file
"""
# Append model from file to observation container
obs.models(gammalib.GModels(model))
# Return observation container
return obs
# ================================ #
# Simulation and analysis pipeline #
# ================================ #
def run_pipeline(obs, emin=0.1, emax=100.0,
enumbins=20, nxpix=200, nypix=200, binsz=0.02,
coordsys="CEL", proj="CAR",
model="${CTOOLS}/share/models/crab.xml",
caldb="prod2", irf="South_50h",
debug=False):
"""
Simulation and binned analysis pipeline.
Keywords:
emin - Minimum energy of cube [TeV] (default: 0.1)
emax - Maximum energy of cube [TeV] (default: 100.0)
enumbins - Number of energy bins in cube (default: 20)
nxpix - Number of RA pixels in cube (default: 200)
nypix - Number of DEC pixels in cube (default: 200)
binsz - Spatial cube bin size [deg] (default: 0.02)
coordsys - Cube coordinate system (CEL or GAL)
proj - Cube World Coordinate System (WCS) projection
model - Model Xml file
caldb - Calibration database path (default: "dummy")
irf - Instrument response function (default: cta_dummy_irf)
debug - Enable debugging (default: False)
"""
# Simulate events
sim = ctools.ctobssim(obs)
sim["debug"] = debug
sim["outevents"] = "obs.xml"
sim.execute()
# Bin events by looping over all observations in the container
sim_obs = gammalib.GObservations("obs.xml")
obs = gammalib.GObservations()
for run in sim_obs:
# Get event filename and set counts cube filename
eventfile = run.eventfile()
cubefile = "cube_"+eventfile
# Bin events for that observation
bin = ctools.ctbin()
bin["inobs"] = eventfile
bin["outcube"] = cubefile
bin["ebinalg"] = "LOG"
bin["emin"] = emin
bin["emax"] = emax
bin["enumbins"] = enumbins
bin["nxpix"] = nxpix
bin["nypix"] = nypix
bin["binsz"] = binsz
bin["coordsys"] = coordsys
bin["usepnt"] = True
bin["proj"] = proj
bin.execute()
# Set observation ID
bin.obs()[0].id(cubefile)
bin.obs()[0].eventfile(cubefile)
# Append result to observations
obs.extend(bin.obs())
# Save XML file
xml = gammalib.GXml()
obs.write(xml)
xml.save("obs_cube.xml")
# Perform maximum likelihood fitting
like = ctools.ctlike()
like["inobs"] = "obs_cube.xml"
like["inmodel"] = model
like["outmodel"] = "fit_results.xml"
like["expcube"] = "NONE"
like["psfcube"] = "NONE"
like["bkgcube"] = "NONE"
like["caldb"] = caldb
like["irf"] = irf
like["debug"] = True # Switch this always on for results in console
like.execute()
# Return
return
# ======================== #
# Main routine entry point #
# ======================== #
if __name__ == '__main__':
"""
"""
# Dump header
print("********************************************")
print("* CTA binned analysis pipeline *")
print("********************************************")
# Setup observations
obs = setup_observations()
# Setup model
obs = setup_model(obs)
# Run analysis pipeline
run_pipeline(obs)