| Observation ID | Sequence Number | Target Name | Observation Date | Public Date | Observer | Aimpoint RA (deg) | Aimpoint DEC (deg) | Aimpoint Roll (deg) |
| 4148 | 700827 | MRK 421 | 2002-10-26 00:06:06 | 2003-10-31 20:18:28 | Dr. Fabrizio Nicastro | 166.097670 | 38.192018 | 48.657281 |
| Instrument | Gratings | Detector | Observation Mode | Data Mode | Read Mode | Exposure Time (s) | Defocus (mm) | Focal Length (mm) | Sim X | Sim Z |
| ACIS | LETG | ACIS-456789 | POINTING | GRADED | TIMED | 91480.90 | 0.00144494 | 10070.000 | -0.682823 | -182.134486 |