Implement deadtime correction in ctobssim.

The deadtime is controlled using the deadc parameter. An additional MC process decides whether a photon event or a background event falls within a dead period of the system or not.

Implement deadtime correction in ctobssim.
The deadtime is controlled using the deadc parameter. An additional MC process decides whether a photon event or a background event falls within a dead period of the system or not.
knodlseder
1 parent cd217310
Showing 2 changed files with 11 additions and 3 deletions
ChangeLog
NEWS
-2012-02-28  Juergen Knoedlseder  <jurgen.knodlseder@irap.omp.eu>
+2012-03-08  Juergen Knoedlseder  <jurgen.knodlseder@irap.omp.eu>
         * Version 0.4.0 released
         ========================
         Add handling of observation definition XML files to ctselect, ctbin
           and ctlike
+        Add deadtime correction factor to ctobssim
         No longer query output parameters first
         Remove method parameter from ctlike and replace evfile and cntmap
           parameters by infile parameter 
@@ -2,7 +2,7 @@ New Features and Important Changes in ctools 00-04-00
 Author(s) : Juergen Knoedlseder
-February 28, 2012
+March 8, 2012
 1. Introduction
@@ -32,7 +32,14 @@ statically linked to the ctools library.
 4. ctobssim - CTA observation simulation
 ----------------------------------------
-None
+Add deadc parameter to control the deadtime correction factor for the
+observation. The deadtime correction factor deadc is the ratio between
+livetime and ontime. A typical value of deadc=0.95 means 5% deadtime.
+
+An additional Monte Carlo process has been introduced for photons and
+background events to select only those events that fall in the livetime
+fraction of the exposure. This means that background rates are expected
+in events per real time (and not events per livetime).
 5. ctselect - CTA event selection