GTI

class gammapy.data.GTI(table)

Bases: object

Good time intervals (GTI) Table.

Data format specification: GTI

Note: at the moment dead-time and live-time is in the EVENTS header … the GTI header just deals with observation times.

Parameters:

table : Table

GTI table

Examples

Load GTIs for a H.E.S.S. event list:

>>> from gammapy.data import GTI
>>> gti = GTI.read('$GAMMAPY_DATA/hess-dl3-dr1//data/hess_dl3_dr1_obs_id_023523.fits.gz')
>>> print(gti)
GTI info:
- Number of GTIs: 1
- Duration: 1687.0 s
- Start: 53343.92234009259 MET
- Start: 2004-12-04T22:08:10.184(TT)
- Stop: 53343.94186555556 MET
- Stop: 2004-12-04T22:36:17.184(TT)

Load GTIs for a Fermi-LAT event list:

>>> gti = GTI.read('$GAMMAPY_DATA/fermi_2fhl/2fhl_events.fits.gz')
>>> print(gti)
GTI info:
- Number of GTIs: 36589
- Duration: 171273490.97510204 s
- Start: 54682.659499814814 MET
- Start: 2008-08-04T15:49:40.784(TT)
- Stop: 57053.99355074074 MET
- Stop: 2015-01-31T23:50:42.784(TT)

Attributes Summary

time_delta	GTI durations in seconds (Quantity).
time_start	GTI start times (Time).
time_stop	GTI end times (Time).
time_sum	Sum of GTIs in seconds (Quantity).

Methods Summary

read(filename, **kwargs)	Read from FITS file.
select_time(time_interval)	Select and crop GTIs in time interval.

Attributes Documentation

time_delta

GTI durations in seconds (Quantity).

time_start

GTI start times (Time).

time_stop

GTI end times (Time).

time_sum

Sum of GTIs in seconds (Quantity).

Methods Documentation

classmethod read(filename, **kwargs)

Read from FITS file.

Parameters:

filename : Path, str

Filename

select_time(time_interval)

Select and crop GTIs in time interval.

Parameters:

time_interval : astropy.time.Time

Start and stop time for the selection.

Returns:

gti : GTI

Copy of the GTI table with selection applied.