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Table 3
Archival Chandra ACIS-I and Swift XRT observations of the M 31 central region.
| Telescope/Instrument | ObsID | t expa | Start date |
| [ks] | [UT] | ||
|
|
|||
| Chandra ACIS-I | 7136 | 4.0 | 2006-01-06.84 |
| Chandra ACIS-I | 7137 | 4.0 | 2006-05-26.18 |
| Chandra ACIS-I | 7138 | 4.1 | 2006-06-09.68 |
| Chandra ACIS-I | 7139 | 4.0 | 2006-07-31.02 |
| Swift XRT | 00030802001 | 5.9 | 2006-09-01.75 |
| Swift XRT | 00030804001 | 5.9 | 2006-09-11.73 |
| Chandra ACIS-I | 7140 | 4.1 | 2006-09-24.76 |
| Chandra ACIS-I | 7064 | 23.2 | 2006-12-04.88 |
| Chandra ACIS-I | 8183 | 4.0 | 2007-01-14.86 |
| Chandra ACIS-I | 8184 | 4.1 | 2007-02-14.08 |
| Chandra ACIS-I | 8185 | 4.0 | 2007-03-10.25 |
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