diff --git a/doc/source/reference_manual/csobsdef.rst b/doc/source/reference_manual/csobsdef.rst
new file mode 100644
index 0000000..cccf75d
--- /dev/null
+++ b/doc/source/reference_manual/csobsdef.rst
@@ -0,0 +1,77 @@
+.. _csobsdef:
+
+csobsdef
+========
+
+Generates an observation definition file.
+
+
+Synopsis
+--------
+
+Generates an observation definition file.
+
+
+General parameters
+------------------
+
+``inpnt [file]``
+    Pointing definition ASCII file in colon separated values format.
+
+``outobs [file]``
+    Output Observation Definition XML file.
+
+``caldb [string]``
+    Calibration database.
+ 	 	 
+``irf [string]``
+    Instrumental response function.
+
+``emin [real]``
+    Lower energy limit of events (in TeV).
+ 	 	 
+``emax [real]``
+    Upper energy limit of events (in TeV).
+ 	 	 
+``duration [real]``
+    Duration of observation (in seconds).
+
+``rad [real]``
+    ROI radius (in degrees).
+
+``(deadc = 0.95) [real]``
+    Average deadtime correction factor.
+ 	 	 
+
+Standard parameters
+-------------------
+
+``(chatter = 2) [integer]``
+    Verbosity of the executable:
+     chatter = 0: no information will be logged
+     
+     chatter = 1: only errors will be logged
+     
+     chatter = 2: errors and actions will be logged
+     
+     chatter = 3: report about the task execution
+     
+     chatter = 4: detailed report about the task execution
+ 	 	 
+``(clobber = yes) [boolean]``
+    Specifies whether an existing output counts cube should be overwritten.
+ 	 	 
+``(debug = no) [boolean]``
+    Enables debug mode. In debug mode the executable will dump any log file output to the console.
+ 	 	 
+``(mode = ql) [string]``
+    Mode of automatic parameters (default is "ql", i.e. "query and learn").
+
+``(logfile = csobsdef.log) [string]``
+    Log filename.
+
+
+Related tools
+-------------
+
+None
diff --git a/doc/source/reference_manual/index.rst b/doc/source/reference_manual/index.rst
index e396ddf..4495dee 100644
--- a/doc/source/reference_manual/index.rst
+++ b/doc/source/reference_manual/index.rst
@@ -36,6 +36,7 @@ cscripts
    :maxdepth: 1
 
    cscaldb --- Lists available instrument response functions <cscaldb>
+   csobsdef --- Generates observation definition file <csobsdef>
    cspull --- Generates pull distribution <cspull>
    cssens --- Computes CTA sensitivity <cssens>
    csresmap --- Generates residual map <csresmap>
diff --git a/scripts/Makefile.am b/scripts/Makefile.am
index 5511cdd..077ac82 100644
--- a/scripts/Makefile.am
+++ b/scripts/Makefile.am
@@ -6,11 +6,13 @@ binscripts = cta_kb_bkgrates.py cta_root2irf.py cta_make_nodes.py \
 
 # Scripts to be distributed in pythondir
 pythonscripts = cspull.py cssens.py cstsdist.py cscaldb.py csresmap.py \
+                csobsdef.py \
                 lsmodel.py \
 				obsutils.py
 
 # Scripts for which symbolic links will be created in bindir
-linkscripts = cspull cssens cstsdist cscaldb csresmap\
+linkscripts = cspull cssens cstsdist cscaldb csresmap \
+              csobsdef \
               lsmodel
 
 # Distribute scripts
diff --git a/scripts/csobsdef.py b/scripts/csobsdef.py
new file mode 100755
index 0000000..8da6027
--- /dev/null
+++ b/scripts/csobsdef.py
@@ -0,0 +1,319 @@
+#! /usr/bin/env python
+# ==========================================================================
+# Generation of an observation definition file.
+#
+# 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
+import sys
+
+
+# ============== #
+# csobsdef class #
+# ============== #
+class csobsdef(ctools.cscript):
+    """
+    The csobsdef class generates an observation definition file from a
+    pointing list.
+    """
+    def __init__(self, *argv):
+        """
+        Constructor.
+        """
+        # Set name and version
+        self.name    = "csobsdef"
+        self.version = "1.0.0"
+
+        # Initialise class members
+        self.obs        = gammalib.GObservations()
+        self.inpnt      = ""
+        self.tmin       = 0.0
+        self.outfile    = ""
+        self.chatter    = 2
+        self.clobber    = True
+        self.debug      = False
+        self.read_ahead = False
+        
+        # Make sure that parfile exists
+        file = self.parfile()
+
+        # Initialise application
+        if len(argv) == 0:
+            ctools.cscript.__init__(self, self.name, self.version)
+        elif len(argv) ==1:
+            ctools.cscript.__init__(self, self.name, self.version, *argv)
+        else:
+            raise TypeError("Invalid number of arguments given.")
+
+        # Set logger properties
+        self.log_header()
+        self.log.date(True)
+
+        # Return
+        return
+    
+    def __del__(self):
+        """
+        Destructor.
+        """
+        # Return
+        return
+
+    def parfile(self):
+        """
+        Check if parfile exists. If parfile does not exist then create a
+        default parfile. This kluge avoids shipping the cscript with a parfile.
+        """
+        # Set parfile name
+        parfile = self.name+".par"
+
+        # Test parfile existence, and create parfile if it does not exist
+        try:
+            pars = gammalib.GApplicationPars(parfile)
+        except:
+            # Signal that parfile was not found
+            print("Parfile \""+parfile+"\" not found. Create default parfile.")
+            
+            # Create default parfile
+            pars = gammalib.GApplicationPars()
+            pars.append(gammalib.GApplicationPar("inpnt","f","a","NONE","","","Pointing definition file"))
+            pars.append(gammalib.GApplicationPar("outobs","f","a","obs.xml","","","Output observation definition file"))
+            pars.append(gammalib.GApplicationPar("caldb","s","a","dummy","","","Calibration database"))
+            pars.append(gammalib.GApplicationPar("irf","s","a","cta_dummy_irf","","","Instrument response function"))
+            pars.append(gammalib.GApplicationPar("emin","r","a","0.1","","","Lower energy limit (TeV)"))
+            pars.append(gammalib.GApplicationPar("emax","r","a","100.0","","","Upper energy limit (TeV)"))
+            pars.append(gammalib.GApplicationPar("duration","r","a","1800.0","","","Pointing duration"))
+            pars.append(gammalib.GApplicationPar("rad","r","a","5.0","","","Radius of ROI (degrees)"))
+            pars.append(gammalib.GApplicationPar("deadc","r","h","0.95","","","Deadtime correction factor"))
+            pars.append_standard()
+            pars.append(gammalib.GApplicationPar("logfile","f","h","csobsdef.log","","","Log filename"))
+            pars.save(parfile)
+        
+        # Return
+        return
+        
+    def get_parameters(self):
+        """
+        Get parameters from parfile.
+        """
+        # Read parameters    
+        self.inpnt = self["inpnt"].filename()
+
+        # Read ahead parameters
+        if self.read_ahead:
+            self.outfile = self["outobs"].filename()
+
+        # Set some fixed parameters
+        self.chatter = self["chatter"].integer()
+        self.clobber = self["clobber"].boolean()
+        self.debug   = self["debug"].boolean()
+
+        # Return
+        return
+    
+    def execute(self):
+        """
+        Execute the script.
+        """
+        # Set read ahead flag
+        self.read_ahead = True
+        
+        # Run the script
+        self.run()
+
+        # Save observation definition file
+        self.obs.save(self.outfile)
+        
+        # Return
+        return
+
+    def run(self):
+        """
+        Run the script.
+        """
+        # Switch screen logging on in debug mode
+        if self.logDebug():
+            self.log.cout(True)
+
+        # Get parameters
+        self.get_parameters()
+        
+        # Write input parameters into logger
+        if self.logTerse():
+            self.log_parameters()
+            self.log("\n")
+
+        # Load pointing definition file
+        pntdef = gammalib.GCsv(self.inpnt, ",")
+        ncols  = pntdef.ncols()
+        npnt   = pntdef.nrows()-1
+
+        # Throw an exception is there is no header information
+        if pntdef.nrows() < 1:
+            raise gammalib.GException.invalid_value(self.name,
+                  "No header found in pointing definition file.")
+
+        # Clear observation container
+        self.obs.clear()
+        self.id = 1
+
+        # Extract header from pointing definition file
+        header = []
+        for col in range(ncols):
+            header.append(pntdef[0,col])
+
+        # Loop over all pointings
+        for pnt in range(npnt):
+
+            # Set row index
+            row = pnt + 1
+        
+            # Create CTA observation
+            obs = gammalib.GCTAObservation()
+
+            # Set observation name
+            if "name" in header:
+                name = pntdef[row, header.index("name")]
+            else:
+                name = "None"
+            obs.name(name)
+
+            # Set identifier
+            if "id" in header:
+                id = pntdef[row, header.index("id")]
+            else:
+                id       = "%6.6d" % self.id
+                self.id += 1
+            obs.id(id)
+
+            # Set pointing
+            if "ra" in header and "dec" in header:
+                ra     = float(pntdef[row, header.index("ra")])
+                dec    = float(pntdef[row, header.index("dec")])
+                pntdir = gammalib.GSkyDir()
+                pntdir.radec_deg(ra,dec)
+            elif "lon" in header and "lat" in header:
+                lon    = float(pntdef[row, header.index("lon")])
+                lat    = float(pntdef[row, header.index("lat")])
+                pntdir = gammalib.GSkyDir()
+                pntdir.lb_deg(lon,lat)
+            else:
+                raise gammalib.GException.invalid_value(self.name,
+                      "No (ra,dec) or (lon,lat) columns found in pointing"
+                      " definition file.")
+            obs.pointing(gammalib.GCTAPointing(pntdir))
+
+            # Set response function
+            if "caldb" in header:
+                caldb = pntdef[row, header.index("caldb")]
+            else:
+                caldb = self["caldb"].string()
+            if "irf" in header:
+                irf = pntdef[row, header.index("irf")]
+            else:
+                irf = self["irf"].string()
+            cal = gammalib.GCaldb()
+            if gammalib.dir_exists(caldb):
+                cal.rootdir(database)
+            else:
+                cal.open("cta", caldb)
+            obs.response(irf, cal);
+
+            # Set deadtime correction factor
+            if "deadc" in header:
+                deadc = float(pntdef[row, header.index("deadc")])
+            else:
+                deadc = self["deadc"].real()
+            obs.deadc(deadc)
+
+            # Set Good Time Interval
+            if "duration" in header:
+                duration = float(pntdef[row, header.index("duration")])
+            else:
+                duration = self["duration"].real()
+            tmin      = self.tmin
+            tmax      = self.tmin + duration
+            gti       = gammalib.GGti(self.time_reference())
+            tstart    = gammalib.GTime(tmin, self.time_reference())
+            tstop     = gammalib.GTime(tmax, self.time_reference())
+            self.tmin = tmax
+            gti.append(tstart, tstop)
+            obs.ontime(gti.ontime())
+            obs.livetime(gti.ontime()*deadc)
+
+            # Set Energy Boundaries
+            if "emin" in header:
+                emin = float(pntdef[row, header.index("emin")])
+            else:
+                emin = self["emin"].real()
+            if "emax" in header:
+                emax = float(pntdef[row, header.index("emax")])
+            else:
+                emax = self["emax"].real()
+            ebounds = gammalib.GEbounds(gammalib.GEnergy(emin, "TeV"),
+                                        gammalib.GEnergy(emax, "TeV"))
+
+            # Set ROI
+            if "rad" in header:
+                rad = float(pntdef[row, header.index("rad")])
+            else:
+                rad = self["rad"].real()
+            roi = gammalib.GCTARoi(gammalib.GCTAInstDir(pntdir), rad)
+
+            # Create an empty event list
+            list = gammalib.GCTAEventList()
+            list.roi(roi)
+            list.gti(gti)
+            list.ebounds(ebounds)
+            
+            # Attach event list to CTA observation
+            obs.events(list)
+
+            # Append observation
+            self.obs.append(obs)
+
+        # Return
+        return
+
+    def __define_observation(self, header, pntdef, ipnt):
+        """
+        Define one oberservation.
+        """
+        # Create CTA observation
+        obs = gammalib.GCTAObservation()
+        
+        # Return observation
+        return obs
+
+
+# ======================== #
+# Main routine entry point #
+# ======================== #
+if __name__ == '__main__':
+    """
+    Generates observation definition file.
+    """
+    # Create instance of application
+    app = csobsdef(sys.argv)
+    
+    # Open logfile
+    app.logFileOpen()
+    
+    # Execute application
+    app.execute()
+    
\ No newline at end of file