From 503850526be1d142a7f8e044d82977a5039f900c Mon Sep 17 00:00:00 2001 From: Jürgen Knödlseder Date: Thu, 23 May 2019 09:38:19 +0200 Subject: [PATCH] Add information to User Manual about setting of instrument specific scale factors in the model definition XML file --- doc/source/users/user_manual/models_implementation.rst | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+), 0 deletions(-) diff --git a/doc/source/users/user_manual/models_implementation.rst b/doc/source/users/user_manual/models_implementation.rst index a2d8c11..9477968 100644 --- a/doc/source/users/user_manual/models_implementation.rst +++ b/doc/source/users/user_manual/models_implementation.rst @@ -94,3 +94,43 @@ term will be appended to each ```` tag. made some modifications. Nevertheless, the format used by the Fermi/LAT ScienceTools is also supported. + +.. note:: + + To cope with cross-calibration uncertainties between different instruments, + instrument specific scaling factors :math:`S_{\rm inst}` can be multiplied + to the source models according to + + .. math:: + M(p,E,t) = S_{\rm inst} \times M_{\rm spatial}(p|E) \times M_{\rm spectral}(E) \times M_{\rm temporal}(t) + + and an example for the specification of scale factors :math:`S_{\rm CTA}` for + ``CTA`` and :math:`S_{\rm HESS}` for H.E.S.S. in the + :ref:`model definition XML file ` + is shown below. + In the example, :math:`S_{\rm CTA}` is fixed to :math:`1`, hence the + scale factor could also be omitted from the XML file. + The scale factor :math:`S_{\rm HESS}` is set to :math:`1.1` and will be + fitted during the model fit. + + .. code-block:: xml + + + + + + + + + + + + + + + + + + + + -- libgit2 0.21.4