DataStoreObservation

class gammapy.data.DataStoreObservation(obs_id, data_store, obs_filter=None)[source]

Bases: object

IACT data store observation.

Parameters:
obs_id : int

Observation ID

data_store : DataStore

Data store

obs_filter : ObservationFilter, optional

Filter for the observation

Attributes Summary

aeff Load effective area object.
bkg Load background object.
edisp Load energy dispersion object.
events Load gammapy.data.EventList object and apply the filter.
fixed_pointing_info Fixed pointing info for this observation (FixedPointingInfo).
gti Load gammapy.data.GTI object and apply the filter.
muoneff Observation muon efficiency.
obs_info Observation information (OrderedDict).
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.
target_radec Target RA / DEC sky coordinates (SkyCoord).
tstart Observation start time (Time).
tstop Observation stop time (Time).

Methods Summary

check(self[, checks]) Run checks.
load(self[, hdu_type, hdu_class]) Load data file as appropriate object.
location(self[, hdu_type, hdu_class]) HDU location object.
peek(self) Quick-look plots in a few panels.
select_time(self, time_interval) Select a time interval of the observation.

Attributes Documentation

aeff

Load effective area object.

bkg

Load background object.

edisp

Load energy dispersion object.

events

Load gammapy.data.EventList object and apply the filter.

fixed_pointing_info

Fixed pointing info for this observation (FixedPointingInfo).

gti

Load gammapy.data.GTI object and apply the filter.

muoneff

Observation muon efficiency.

obs_info

Observation information (OrderedDict).

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: https://en.wikipedia.org/wiki/Dead_time https://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.

target_radec

Target RA / DEC sky coordinates (SkyCoord).

tstart

Observation start time (Time).

tstop

Observation stop time (Time).

Methods Documentation

check(self, checks='all')[source]

Run checks.

This is a generator that yields a list of dicts.

load(self, hdu_type=None, hdu_class=None)[source]

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(self, hdu_type=None, hdu_class=None)[source]

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

peek(self)[source]

Quick-look plots in a few panels.

select_time(self, time_interval)[source]

Select a time interval of the observation.

Parameters:
time_interval : astropy.time.Time

Start and stop time of the selected time interval. For now we only support a single time interval.

Returns:
new_obs : DataStoreObservation

A new observation instance of the specified time interval