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.. _fluxcal_v1:

The 2013 Flux Calibration used in uvotpy-1.0 
=============================================

The flux calibration consists of two components, the 
calibration of the coincidence loss and the effective 
area for each grism mode which is independent of the 
coincidence loss. The initial coincidence loss correction 
developed in 2012-2013 used an ad-hoc method and worked 
for sources up to a certain limit in brightness. The 
correction became uncertain when about half or more of the counts 
were lost due to coincidence loss.  This method was 
implemented in the ``uvotpy-1.0`` software, and thus is 
retained and the details can be consulted below.

In 2014 we succeeded in reformulating the coincidence loss 
and make it completely consistent with the accepted and 
successful theory used for point source and background. 
This is discussed in the current pages :ref:`coincidenceloss` and
:ref:`eff_area`. The new method has been implemented in 
the ``uvotpy-2.x`` software.  

The following pages describe the details of the old calibration.
   
.. toctree::
   :maxdepth: 2
   
   general.rst
   uv_nominal.rst
   uv_clocked.rst
   visual_nominal.rst   
   visual_clocked.rst