DataStoreObservation

class gammapy.data.DataStoreObservation(obs_id, data_store)

Bases: object

IACT data store observation.

See Data Store

Attributes Summary

aeff	Load effective area object (lazy property).
bkg	Load background object (lazy property).
edisp	Load energy dispersion object (lazy property).
events	Load gammapy.data.EventList object (lazy property).
gti	Load gammapy.data.GTI object (lazy property).
muoneff	Observation muon efficiency.
observation_dead_time_fraction	Dead-time fraction (float).
observation_live_time_duration	Live-time duration in seconds (Quantity).
observation_time_duration	Observation time duration in seconds (Quantity).
observatory_earth_location	Observatory location (EarthLocation).
pointing_altaz	Pointing ALT / AZ sky coordinates (SkyCoord).
pointing_radec	Pointing RA / DEC sky coordinates (SkyCoord).
pointing_zen	Pointing zenith angle sky (Quantity).
psf	Load point spread function object (lazy property).
target_radec	Target RA / DEC sky coordinates (SkyCoord).
tstart	Observation start time (Time).
tstop	Observation stop time (Time).

Methods Summary

load([hdu_type, hdu_class])	Load data file as appropriate object.
location([hdu_type, hdu_class])	HDU location object.
make_exposure_image(fov, energy_range)	Make exposure image.
make_psf(position[, energy, rad])	Make energy-dependent PSF for a given source position.
peek()	Quick-look plots in a few panels.

Attributes Documentation

aeff

Load effective area object (lazy property).

bkg

Load background object (lazy property).

edisp

Load energy dispersion object (lazy property).

events

Load gammapy.data.EventList object (lazy property).

gti

Load gammapy.data.GTI object (lazy property).

muoneff

Observation muon efficiency.

observation_dead_time_fraction

Dead-time fraction (float).

Defined as dead-time over observation time.

Dead-time is defined as the time during the observation where the detector didn’t record events: http://en.wikipedia.org/wiki/Dead_time http://adsabs.harvard.edu/abs/2004APh....22..285F

The dead-time fraction is used in the live-time computation, which in turn is used in the exposure and flux computation.

observation_live_time_duration

Live-time duration in seconds (Quantity).

The dead-time-corrected observation time.

Computed as t_live = t_observation * (1 - f_dead) where f_dead is the dead-time fraction.

observation_time_duration

Observation time duration in seconds (Quantity).

The wall time, including dead-time.

observatory_earth_location

Observatory location (EarthLocation).

pointing_altaz

Pointing ALT / AZ sky coordinates (SkyCoord).

pointing_radec

Pointing RA / DEC sky coordinates (SkyCoord).

pointing_zen

Pointing zenith angle sky (Quantity).

psf

Load point spread function object (lazy property).

target_radec

Target RA / DEC sky coordinates (SkyCoord).

tstart

Observation start time (Time).

tstop

Observation stop time (Time).

Methods Documentation

load(hdu_type=None, hdu_class=None)

Load data file as appropriate object.

Parameters:

hdu_type : str

HDU type (see VALID_HDU_TYPE)

hdu_class : str

HDU class (see VALID_HDU_CLASS)

Returns:

object : object

Object depends on type, e.g. for events it’s a EventList.

location(hdu_type=None, hdu_class=None)

HDU location object.

Parameters:

hdu_type : str

HDU type (see VALID_HDU_TYPE)

hdu_class : str

HDU class (see VALID_HDU_CLASS)

Returns:

location : HDULocation

HDU location

make_exposure_image(fov, energy_range)

Make exposure image.

TODO: Do we want such methods here or as standalone functions that work with obs objects?

make_psf(position, energy=None, rad=None)

Make energy-dependent PSF for a given source position.

Parameters:

position : SkyCoord

Position at which to compute the PSF

energy : Quantity

1-dim energy array for the output PSF. If none is given, the energy array of the PSF from the observation is used.

rad : Angle

1-dim offset wrt source position array for the output PSF. If none is given, the offset array of the PSF from the observation is used.

Returns:

psf : EnergyDependentTablePSF

Energy dependent psf table

peek()

Quick-look plots in a few panels.