| obs. | instrument | observation | MJDa | exposure | total duration | |
| no. | ID | date | (s) | (s) | ||
| 1 | ROSAT- PSPCB | rp200108n00 | 1991, Dec. 15 | 48605.41 | 1610 | 2839 |
| 2 | ROSAT- PSPCB | rp900176n00 | 1992, Jun. 12 | 48785.94 | 24 321 | 225 050 |
| 3 | ROSAT- PSPCB | rp201262n00 | 1992, Aug. 09 | 48843.93 | 5665 | 42 858 |
| 4 | ROSAT- PSPCB | rp900176a01 | 1992, Dec. 15 | 48971.73 | 14 544 | 2 096 652 |
| 5 | ASCA- SIS0+SIS1 | 20018000 | 1993, Aug. 24 | 49223.76 | 30 048 | 74260 |
| 6 | ASCA- SIS0+SIS1 | 26033000 | 1997, Jan. 24 | 50806.90 | 37 712 | 113 184 |
| 7 | XMM-Newton- MOS1+PNb | 0112580601 | 2000, Jul. 26 | 51751.71 | 31 600c | 36 604 |
| 8 | XMM-Newton- MOS1+PNb | 0112580701 | 2000, Jul. 27 | 51753.50 | 9700c | 12 572 |
| 9 | XMM-Newton- MOS1+MOS2+PN | 0112560101 | 2001, Jun. 25 | 52085.79 | 23 900c | 36 994 |
| 10 | XMM-Newton- MOS1+MOS2+PN | 0112560201 | 2001, Jun. 28 | 52088.81 | 27 500c | 38 506 |
| 11 | XMM-Newton- MOS1+MOS2+PN | 0112560301 | 2001, Jun. 30 | 52090.70 | 32 600c | 37 474 |
| 12 | XMM-Newton- RGS1+RGS2+MOS1 | 0112560201 | 2001, Jun. 28 | 52088.81 | 25 300c | 38 506 |
| 13 | XMM-Newton- RGS1+RGS2+MOS1 | 0112560301 | 2001, Jun. 30 | 52090.70 | 33 300c | 37 474 |
|
a Exposure start. b MOS2 was in "small window mode'', with WR 25 close to the edge of the central CCD, which renders the data unusable. c Some exposure time was lost due to (solar) high soft proton rate. Average exposure time is shown here, individual exposures for MOS1, MOS2, PN, RGS1, RGS2 are slightly different. |