| Observation ID | Sequence Number | Target Name | Observation Date | Public Date | Observer | Aimpoint RA (deg) | Aimpoint DEC (deg) | Aimpoint Roll (deg) |
| 457 | 790018 | MKN 421 | 1999-11-05 01:16:35 | 2000-01-28 00:00:00 | DR. AXAF CALIBRATION | 166.119360 | 38.211480 | 54.117764 |
| Instrument | Gratings | Detector | Observation Mode | Data Mode | Read Mode | Exposure Time (s) | Defocus (mm) | Focal Length (mm) | Sim X | Sim Z |
| ACIS | HETG | ACIS-56789 | POINTING | FAINT | TIMED | 25831.91 | 0.00144494 | 10061.620 | -0.682823 | -186.242877 |