Table 1.
X-ray observations of XMMU J122939.7+075333.
| Instrument | Obs. ID | Start date | End date | Exposure | Off-axis | Net rate |
|---|---|---|---|---|---|---|
| YYYY-MM-DD hh-mm-ss | (ks) | (arcmin) | (cts/ks) | |||
| Einstein/HRI | 7068 | 1979-12-31 11:10:17 | 1981-01-10 13:47:58 | 32.8 | 6.8 | 2.5 ± 0.4 (a) |
| ROSAT/HRI | 600216 | 1992-12-10 22:34:54 | 1992-12-14 11:37:52 | 7.0 | 7.8 | 5.3 ± 1.1 (b) |
| ROSAT/PSPC | 600248 | 1992-12-26 23:04:44 | 1992-12-29 20:21:42 | 25.1 | 6.8 | 17.0 ± 1.1 (c) |
| ROSAT/HRI | 600216 | 1994-06-19 00:22:08 | 1994-07-09 03:15:59 | 27.1 | 5.9 | 5.3 ± 0.5 (b) |
| CXO/ACIS-I | 322 | 2000-03-19 12:01:38 | 2000-03-19 15:42:42 | 10.4 | 6.9 | 4.2 ± 0.6 (d) |
| CXO/ACIS-S | 321 | 2000-06-12 01:48:50 | 2000-06-12 13:31:49 | 39.6 | 6.9 | 8.8 ± 0.5 (d) |
| XMM/PN | 0112550601 | 2002-06-05 13:20:09 | 2002-06-05 16:48:32 | 11.1 | 6.4 | 49.6 ± 2.2 (e) |
| XMM/PN | 0200130101 | 2004-01-01 03:46:56 | 2004-01-02 05:19:03 | 79.0 | 6.7 | 10.1 ± 0.5 (e) |
| XMM/PN | 0510011501 | 2008-01-07 04:16:44 | 2008-01-07 04:50:22 | 1.1 | 0 | 45.5 ± 8.7 (e) |
| CXO/ACIS-S | 8095 | 2008-02-23 20:10:45 | 2008-02-23 21:53:42 | 5.1 | 6.5 | 10.0 ± 1.4 (d) |
| CXO/ACIS-S | 11274 | 2010-02-27 18:16:16 | 2010-02-28 05:58:04 | 39.7 | 6.7 | <0.4 (d) |
| CXO/ACIS-S | 12978 | 2010-11-20 10:14:49 | 2010-11-20 16:17:55 | 19.8 | 0 | 0.8 ± 0.2 (d) |
| CXO/ACIS-S | 12889 | 2011-02-14 12:08:04 | 2011-02-16 02:48:40 | 135.6 | 6.7 | 2.1 ± 0.1 (d) |
| CXO/ACIS-S | 12888 | 2011-02-21 20:24:22 | 2011-02-23 17:49:49 | 159.3 | 6.7 | 1.0 ± 0.1 (d) |
| XMM/PN | 0722670301 | 2014-01-09 19:05:24 | 2014-01-10 08:09:17 | 13.8 | 14.9 | 16.1 ± 1.3 (e) |
| XMM/PN | 0722670601 | 2014-01-13 12:09:00 | 2014-01-13 20:13:02 | 25.8 | 14.9 | 3.1 ± 0.5 (e) |
| CXO/ACIS-I | 15760 | 2014-04-26 03:27:40 | 2014-04-26 12:04:26 | 29.4 | 9.3 | <0.5 (d) |
| CXO/ACIS-S | 16260 | 2014-08-04 18:47:09 | 2014-08-05 02:24:31 | 24.7 | 2.0 | 2.3 ± 0.4 (d) |
| CXO/ACIS-S | 16261 | 2015-02-24 09:10:20 | 2015-02-24 16:08:51 | 22.8 | 2.0 | <0.7 (d) |
| XMM/PN | 0761630101 | 2016-01-05 09:05:51 | 2016-01-06 17:03:12 | 100.7 | 0 | 17.4 ± 0.5 (e) |
| XMM/PN | 0761630201 | 2016-01-07 10:09:24 | 2016-01-08 17:22:51 | 98.3 | 0 | 11.5 ± 0.5 (e) |
| XMM/PN | 0761630301 | 2016-01-09 08:48:39 | 2016-01-10 16:29:43 | 100.1 | 0 | 7.6 ± 0.4 (e) |
| CXO/ACIS-S | 16262 | 2016-04-30 00:54:33 | 2016-04-30 08:32:53 | 24.7 | 1.0 | 0.50 ± 0.15 (d) |
| CXO/ACIS-S | 21647 | 2019-04-17 03:39:21 | 2019-04-17 12:35:16 | 29.7 | 1.0 | <0.7 (d) |
Notes. (a)From the HRIEXO catalog. (b)From the 1RXH catalog. (c)In the 0.15–2 keV energy band, within 54″. (d)In the 0.3–2 keV energy band; we used elliptical regions including ∼95% of the PSF (their semimajor axes extend from ∼7.5 to 13.5 arcsec, depending on the off-axis). The upper limits are at a 3σ confidence level. (e)In the 0.15–2 keV energy band, within 15″.
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