| Satellite | Obs. start | Obs. start | Exposure | On-source time (ks) | |
| date | time (UT) | (ks) | |||
| EXOSAT | 22 Oct. 1983 | 21:50:00 | 15.2 | 14.7 | (GSPC) |
| 21:53:04 | 14.8 | 13.4 | (ME)* | ||
| 02 Jun. 1985 | 06:54:08 | 16.3 | 14.8 | (GSPC) | |
| 06:57:20 | 5.3 | 5.2 | (ME) | ||
| 08:37:36 | 10.2 | 8.9 | (ME) | ||
| ROSAT | 04 May 1993 | 12:28:52 | 98.1 | 7.9 | (PSPC B) |
| RXTE | 14 Dec. 1997 | 03:44:11 | 15.0 | 8.4 | (PCA) |
| 03:44:11 | 15.0 | 2.6 | (HEXTE) | ||
| BeppoSAX | 04 May 1998 | 22:05:14 | 92.4 | 20.0 | (LECS) |
| 22:05:14 | 92.4 | 46.4 | (MECS) | ||
| 22:05:14 | 92.4 | 20.0 | (HPGSPC) | ||
| 22:05:14 | 92.4 | 21.0 | (PDS) | ||
| Swift | 19 Apr. 2006 | 21:02:10 | 7.1 | 2.5 | (XRT) |
* Results from this observation were partially presented by Cook et al. (1984).