| 2006-Nov-22 | Full recalibration of archival STIS data started |
| 2006-Nov-03 | Echelle data flux calibration significantly improved |
| 2005-Dec-13 | New combined grating/aperture correction implemented |
| 2004-Aug-03 | Side-2 electronics failed |
| 2003-Dec-16 | Charge transfer inefficiency correction implemented for CCD data |
| 2003-Nov-13 | Time-dependent sensitivity correction implemented for CCD data |
| 2003-Jul-17 | E2 and D1 pseudo-apertures defined |
| 2002-Sep-05 | Blaze shift correction for echelle data implemented |
| 2002-Sep-05 | Time-dependent sensitivity correction implemented for MAMA data |
| 2002-May-05 | Servicing Mission 3B programs finished |
| 2002-Mar-12 | Servicing Mission 3B programs started |
| 2001-Jul-10 | Side-2 electronics enabled |
| 2001-May-16 | Side-1 electronics failed |
| 2001-May-01 | On-the-fly-recalibration (OTFR) enabled |
| 2000-Jul-03 | E1 pseudo-apertures defined |
| 2000-Feb-06 | Servicing Mission 3A programs finished |
| 1999-Dec-27 | Servicing Mission 3A programs started |
| 1999-Dec-14 | On-the-fly-calibration (OTFC) enabled |
| 1999-Mar-15 | G140L and G140M moved from 3" above center to 3"
below center to avoid repeller wire shadow |
| 1997-Sep-25 | Servicing Mission 2 programs finished |
| 1997-Feb-21 | Servicing Mission 2 programs started |
| 1997-Feb-14 | STIS installed on HST |
