def from_ogip_files(cls, filename):
"""Read `~gammapy.spectrum.SpectrumDatasetOnOff` from OGIP files.
BKG file, ARF, and RMF must be set in the PHA header and be present in
the same folder.
The naming scheme is fixed to the following scheme:
* PHA file is named ``pha_obs{name}.fits``
* BKG file is named ``bkg_obs{name}.fits``
* ARF file is named ``arf_obs{name}.fits``
* RMF file is named ``rmf_obs{name}.fits``
with ``{name}`` the dataset name.
Parameters
----------
filename : str
OGIP PHA file to read
"""
filename = make_path(filename)
dirname = filename.parent
with fits.open(filename, memmap=False) as hdulist:
data = _read_ogip_hdulist(hdulist)
counts = CountsSpectrum(energy_hi=data["energy_hi"],
energy_lo=data["energy_lo"],
data=data["data"])
phafile = filename.name
try:
rmffile = phafile.replace("pha", "rmf")
energy_dispersion = EDispKernel.read(dirname / rmffile)
except OSError:
# TODO : Add logger and echo warning
energy_dispersion = None
try:
bkgfile = phafile.replace("pha", "bkg")
with fits.open(dirname / bkgfile, memmap=False) as hdulist:
data_bkg = _read_ogip_hdulist(hdulist)
counts_off = CountsSpectrum(
energy_hi=data_bkg["energy_hi"],
energy_lo=data_bkg["energy_lo"],
data=data_bkg["data"],
)
acceptance_off = data_bkg["backscal"]
except OSError:
# TODO : Add logger and echo warning
counts_off, acceptance_off = None, None
arffile = phafile.replace("pha", "arf")
aeff = EffectiveAreaTable.read(dirname / arffile)
mask_safe = np.logical_not(data["quality"])
return cls(
counts=counts,
aeff=aeff,
counts_off=counts_off,
edisp=energy_dispersion,
livetime=data["livetime"],
mask_safe=mask_safe,
acceptance=data["backscal"],
acceptance_off=acceptance_off,
name=str(data["obs_id"]),
gti=data["gti"],
)
def test_get_bias_energy():
"""Obs read from file"""
rmffile = "$GAMMAPY_DATA/joint-crab/spectra/hess/rmf_obs23523.fits"
edisp = EDispKernel.read(rmffile)
thresh_lo = edisp.get_bias_energy(0.1)
assert_allclose(thresh_lo.to("TeV").value, 0.9174, rtol=1e-4)
def from_ogip_files(cls, filename):
"""Read `~gammapy.spectrum.SpectrumDatasetOnOff` from OGIP files.
BKG file, ARF, and RMF must be set in the PHA header and be present in
the same folder.
The naming scheme is fixed to the following scheme:
* PHA file is named ``pha_obs{name}.fits``
* BKG file is named ``bkg_obs{name}.fits``
* ARF file is named ``arf_obs{name}.fits``
* RMF file is named ``rmf_obs{name}.fits``
with ``{name}`` the dataset name.
Parameters
----------
filename : str
OGIP PHA file to read
"""
filename = make_path(filename)
dirname = filename.parent
with fits.open(filename, memmap=False) as hdulist:
counts = RegionNDMap.from_hdulist(hdulist, format="ogip")
acceptance = RegionNDMap.from_hdulist(hdulist,
format="ogip",
ogip_column="BACKSCAL")
if "GTI" in hdulist:
gti = GTI(Table.read(hdulist["GTI"]))
else:
gti = None
mask_safe = RegionNDMap.from_hdulist(hdulist,
format="ogip",
ogip_column="QUALITY")
mask_safe.data = np.logical_not(mask_safe.data)
phafile = filename.name
try:
rmffile = phafile.replace("pha", "rmf")
kernel = EDispKernel.read(dirname / rmffile)
edisp = EDispKernelMap.from_edisp_kernel(kernel, geom=counts.geom)
except OSError:
# TODO : Add logger and echo warning
edisp = None
try:
bkgfile = phafile.replace("pha", "bkg")
with fits.open(dirname / bkgfile, memmap=False) as hdulist:
counts_off = RegionNDMap.from_hdulist(hdulist, format="ogip")
acceptance_off = RegionNDMap.from_hdulist(
hdulist, ogip_column="BACKSCAL")
except OSError:
# TODO : Add logger and echo warning
counts_off, acceptance_off = None, None
arffile = phafile.replace("pha", "arf")
aeff = EffectiveAreaTable.read(dirname / arffile)
return cls(
counts=counts,
aeff=aeff,
counts_off=counts_off,
edisp=edisp,
livetime=counts.meta["EXPOSURE"] * u.s,
mask_safe=mask_safe,
acceptance=acceptance,
acceptance_off=acceptance_off,
name=str(counts.meta["OBS_ID"]),
gti=gti,
)
