Table 1.
Summary of analysed H.E.S.S. observations of PSR B1259–63/LS 2883 from 2004 to 2021.
2004 | 2007 | 2011 | 2014 | 2017 | 2021 | ||
---|---|---|---|---|---|---|---|
Start date | Feb. 27 | Apr. 09 | Jan. 10 | Mar. 07 | Aug. 10 | Jan. 16 | |
End date | Jun. 15 | Aug. 08 | Jan. 16 | Jul. 21 | Aug. 20 | Jun. 16 | |
Time − tp [days] | –7 to +98 | –110 to +11 | +26 to +32 | –39 to +78 | –42 to –37 | –23 to +127 | |
Nruns | – | – | – | 141 | 12 | (216) | |
CT5 mono | tL [h] | – | – | – | 62.2 | 6 | (99.4) |
θ [ ° ] | – | – | – | 41.8 | 57 | (42.8) | |
Nruns | 138 | 213 | 11 | 163 | - | 221 | |
CT1-4 stereo | tL [h] | 57.1 | 93.9 | 4.8 | 68.1 | - | 100.0 |
θ [ ° ] | 42.5 | 45.1 | 47.6 | 41.9 | - | 42.8 |
Notes. The number of runs passing spectral quality selection cuts in a given periastron passage is defined as Nruns (see text for further details), tL refers to a periastron passage’s total acceptance-corrected observation time, and finally θ indicates the mean zenith angle of the periastron passage’s observations. Values for years prior to 2021 are taken from H.E.S.S. Collaboration (2020) and references therein. CT1-4 stereo data are those runs in which third or more of the CT1-4 telescopes were active. CT5 mono data corresponds to the data obtained from only the central (and largest) telescope CT5. The 2021 CT5 mono observations are displayed in brackets as they are not presented or utilised in this study.
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