Table 1.
Log of Swift and Chandra observations for GRO J1750−27.
| Swift | |||||
|---|---|---|---|---|---|
| ObsID | MJD | Calendar date | Exposure time | Count rate | |
| (2015) | (ks) | (10−2 counts s−1) | |||
| 000311150[12] | 571[24] | 12-04 | ∼0.8 | 159.1 ± 8.6 | |
| +13 | +26 | 14-04 | ∼0.9 | 134.2 ± 7.5 | |
| +14 | +28 | 16-04 | ∼0.3 | 115 ± 11 | |
| +15 | +30 | 18-04 | ∼0.9 | 119.3 ± 6.2 | |
| +16 | +32 | 20-04 | ∼1.0 | 95.9 ± 6.1 | |
| +17 | +36 | 24-04 | ∼0.9 | 44.7 ± 2.8 | |
| +18 | +38 | 26-04 | " | 23.7 ± 1.8 | |
| +20 | +46 | 04-05 | ∼1.0 | < 2.0 | |
| +22 | +52 | 10-05 | ∼0.9 | < 2.0 | |
| +23 | +54 | 12-05 | ∼1.0 | < 1.6 | |
| +24 | +62 | 20-05 | ∼0.6 | < 2.4 | |
| Chandra | |||||
| ObsID | MJD | Calendar date | Exposure time | Count rate | ϕ |
| (ks) | (10−4 counts s−1) | ||||
| 14643 | 56434 | 22-05-2013 | ∼5 | < 12 | 0.22 |
| 167[23] | 57[162] | 20-05-2015 | ∼27 | 9.0 ± 1.9 | 0.65 |
| +24 | +230 | 27-07-2015 | " | < 2.7 | 0.93 |
| +25 | +318 | 23-10-2015 | ∼29 | 2.8 ± 1.2 | 0.89 |
| +26 | +529 | 21-05-2016 | " | 5.1 ± 1.5 | 0.97 |
| +27 | +891 | 18-05-2017 | " | < 2.0 | 0.11 |
| +[24,27] | – | – | ∼55 | < 1.4 | – |
Notes. The Swift/XRT count rates (with 1σ errors) are for the 0.5–10 keV energy range and XRT upper limits are calculated as mentioned in Sect. 2.1. The Chandra (background subtracted) count rates (with 1σ errors) are given for the 0.5–7 keV energy range and the upper limits are calculated as mentioned in Sect. 2.1 as well. ϕ represents the orbital phase of the binary when the observations were taken (with ϕ = 0 defined as periastron passage and ϕ = 0.5 as apastron). The last row of the table correspond to the count-rate upper limit in the combined observation.
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