1.7	STIS Operations and Calibration Timeline

Here we summarize the milestones in STIS operations and innovations in calibration.

Date	Event
1997-Feb-14	STIS installed on HST
1997-Feb-21	Servicing Mission 2 programs started
1997-Sep-25	Servicing Mission 2 programs finished
1999-Mar-15	G140L and G140M moved from 3" above center to 3" below center to avoid repeller wire (see the STIS Instrument Handbook, Section 7.5 MAMA Spectral Offsetting) shadow
1999-Dec-14	On-the-fly-calibration (OTFC) enabled
1999-Dec-27	Servicing Mission 3A programs started
2000-Feb-06	Servicing Mission 3A programs finished
2000-Jul-03	E1 pseudo-apertures (see the STIS Instrument Handbook, Section 7.2.7 Mitigation...) implemented
2001-May-01	On-the-fly-recalibration (OTFR) enabled
2001-May-16	Side-1 electronics failed, operations suspended
2001-Jul-10	Side-2 electronics enabled, operations resumed
2002-Mar-12	Servicing Mission 3B programs started
2002-May-05	Servicing Mission 3B programs finished
2002-Sep-05	Time-dependent sensitivity correction implemented for MAMA data
2002-Sep-05	Blaze shift correction for echelle data implemented
2003-Aug-04	E2 and D1 pseudo-apertures implemented, E1 pseudo-apertures revised (see Section 4.3.2)
2003-Nov-13	Time-dependent sensitivity correction implemented for CCD data
2003-Dec-16	Charge transfer inefficiency correction implemented for CCD data
2004-Aug-03	Side-2 electronics failed, operations suspended
2005-Dec-13	New combined grating/aperture correction implemented (see Section 3.4.13)
2006-Nov-03	Echelle data flux calibration significantly improved, trace rotation implemented for commonly used first order modes
2006-Nov-22	Full recalibration of archival STIS data started
2009-May-11	Servicing Mission 4 program started
2009-May-17	Side-2 electronics are repaired, operations resumed
2009-May24	Servicing Mission 4 program finished