Observation¶

class gammapy.data.Observation(obs_id=None, gti=None, pointing=None, aeff=None, edisp=None, psf=None, bkg=None, deadtime_fraction=0.0)[source]¶

Bases: object

In-memory observation.

Parameters

obs_idint: Observation ID as identifier
pointingSkyCoord: Pointing position in icrs coordinates
aeffEffectiveAreaTable2D: Effective area used for simulating the observation
edispEnergyDispersion2D: Energy dispersion IRF for simulating the observation
psfPSF3D: PSF IRF used for simulating the observation
bkgBackground3D: Background rate model
gtiGTI: Table with GTI start and stop time
deadtimefloat, optional: Deadtime fraction, defaults to 0

Attributes Summary

`observation_live_time_duration`
`observation_time_duration`
`tstart`
`tstop`

Methods Summary

`create`(pointing[, obs_id, livetime, tstart, …])	Create an observation.
`from_caldb`(pointing[, obs_id, livetime, …])	Create an observation using IRFs from a given CTA CALDB.

Attributes Documentation

observation_live_time_duration¶

observation_time_duration¶

tstart¶

tstop¶

Methods Documentation

classmethod create(pointing, obs_id=None, livetime=None, tstart=None, tstop=None, irfs=None, deadtime_fraction=0.0)[source]¶

Create an observation.

User must either provide the livetime, or the start and stop times.

Parameters

pointingSkyCoord: Pointing position
obs_idint: Observation ID as identifier
livetime~astropy.units.Quantity`: Livetime exposure of the simulated observation
tstartQuantity: Start time of observation
tstopQuantity: Stop time of observation
irfsdict: IRFs used for simulating the observation: bkg, aeff, psf, edisp
deadtime_fractionfloat, optional: Deadtime fraction, defaults to 0

Returns

obsgammapy.data.Observation

classmethod from_caldb(pointing, obs_id=None, livetime=None, tstart=None, tstop=None, caldb='prod2', irf='South0.5hr', deadtime_fraction=0.0)[source]¶

Create an observation using IRFs from a given CTA CALDB.

Parameters

pointingSkyCoord: Pointing position
obs_idint: Observation ID as identifier
livetime~astropy.units.Quantity`: Livetime exposure of the simulated observation
tstartQuantity: Start time of observation
tstopQuantity: Stop time of observation
caldbstr: Calibration database
irfstr: Type of Instrumental response function.
deadtime_fractionfloat, optional: Deadtime fraction, defaults to 0

Returns

obsgammapy.data.Observation