To find and download HEASARC data in the cloud, you can use astroquery.heasarc or download our new tool, hark.
The HEASARC and NuSTAR teams are greatly saddened by the sudden passing of Katja Pottschmidt. Most recently Katja was the lead scientist for the NuSTAR Guest Observer Facility (GOF), a role she had supported for many years. During her science career she worked on many other high energy astrophysics missions and played an integral role in advancing our knowledge of the universe. She was a wonderful colleague and friend and will be keenly missed by all who knew her.
renorm
renormalize model to minimize statistic with current parameters
Renormalize model, or change renorm conditions.
| Syntax: | renorm | [auto|none|prefit] |
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The renorm command will adjust the normalizations of the model by a single multiplication factor, which is chosen to minimize the fit statistic. Such a renorm will be performed explicitly whenever the command is used without a key-word, or during certain XSPEC commands, as determined by the following key-words:
| auto | Renormalize after a model or newpar command, and at the beginning of a fit. |
| prefit | Renormalize only at the beginning of a fit. |
| none | Perform no automatic renormalizations, i.e., only perform them when a renorm command is given explicitly. |
This command works by doing an analytic calculation to change the normalizations of all additive components in the model to minimize the fit statistic. The relative normalizations of the components will not be changed. This analytic calculation cannot be performed for all the fit statistics, in particular it will not work for cstat if there is a background file. If the analytic calculation is not possible this command will have no effect.