Last modified: December 2020

URL: https://cxc.cfa.harvard.edu/sherpa/ahelp/unpack_arf.html
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AHELP for CIAO 4.13 Sherpa v1

unpack_arf

Context: data

Synopsis

Create an ARF data structure.

Syntax

unpack_arf(arg)

Examples

Example 1

>>> arf1 = unpack_arf("arf1.fits")
>>> arf2 = unpack_arf("arf2.fits")

Example 2

Read in an ARF using Crates:

>>> acr = pycrates.read_file("src.arf")
>>> arf = unpack_arf(acr)

Example 3

Read in an ARF using AstroPy:

>>> hdus = astropy.io.fits.open("src.arf")
>>> arf = unpack_arf(hdus)

PARAMETERS

The parameter for this function is:

Parameter Definition
arg Identify the ARF: a file name, or a data structure representing the data to use, as used by the I/O backend in use by Sherpa: a tablecrate for crates, as used by CIAO, or a list of AstroPy HDU objects.

Notes

The `minimum_energy` setting of the `ogip` section of the Sherpa configuration file determines the behavior when an ARF with a minimum energy of 0 is read in. The default is to replace the 0 by the value 1e-10, which will also cause a warning message to be displayed.


Bugs

See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.

See Also

data
dataspace1d, dataspace2d, datastack, fake, get_arf, get_bkg, get_bkg_arf, get_bkg_model, get_bkg_rmf, get_bkg_source, load_arf, load_arrays, load_ascii, load_bkg, load_bkg_arf, load_bkg_rmf, load_data, load_grouping, load_image, load_multi_arfs, load_multi_rmfs, load_pha, load_quality, load_rmf, load_staterror, load_syserror, load_table, pack_image, pack_pha, pack_table, set_arf, unpack_arrays, unpack_ascii, unpack_bkg, unpack_data, unpack_image, unpack_pha, unpack_rmf, unpack_table
filtering
load_filter
info
get_default_id, list_bkg_ids, list_data_ids, list_response_ids
modeling
add_model, add_user_pars, get_response, load_table_model, load_template_interpolator, load_template_model, load_user_model, save_model, save_source
plotting
plot_arf
saving
save_arrays, save_data, save_delchi, save_error, save_filter, save_grouping, save_image, save_pha, save_quality, save_resid, save_staterror, save_syserror, save_table
statistics
load_user_stat