1. Chandra Calibration Status
CUC Meeting Oct. 10, 2012

2. Chandra Calibration Status
Timetable for detector QE and gain updates
Calibration updates since the 2011 CUC meeting
Cross-calibration results
On-going calibration activities
Calibration plans for the upcoming year

3. Timetable for Detector Gain and QE Updates
Gain Updates
QEU updates
at present
by Dec. 2012
ACIS-S
Quarterly
None
Yearly
ACIS-I
HRC-I
HRC-S

4. Calibration products released over the past year
ACIS
An updated ACIS contamination model (CALDB May 30, 2012)
Time-dependent gain corrections for epochs ( Aug 2011 – July 2012)
HRC
HRC-I gain map for 2011 (CALDB Dec. 15, 2011)
HRC background spectra for 2011 (CALDB – Dec. 15, 2011)
Updated low energy HRC-S QE (CALDB – Dec. 15, 2011)
Updated HRC-I and HRC-S de-gap maps (CALDB – Jun. 6, 2012)
HRC-S gain map for new HV setting (CALDB – Jul. 24, 2012)
HETG
Updated HEG and MEG first order transmission efficiencies (CALDB – Dec. 1, 2012)

5. ACIS Contamination Model N007
Updated time-dependence
t (700 eV)
Black data points are ECS measurements and red and blue data points are ACIS-I and ACIS-S observations of A1795

6. ACIS Contamination Model N007
Updated spatial distribution model
D t (center to edge)

7. Cross-calibration with E0102
O VII
O VIII
Ne IX
Ne X

8. MEG and HEG first order transmission efficiency
Simultaneous fit to 30 blazars

9. HEG/MEG first order transmission efficiency (Capella)
Old CALDB
Current CALDB
Current CALDB
Old CALDB

10. July 2012 observations of Mkn 421
HETG/ACIS-S
LETG/ACIS-S

11. Planned AO-14 Calibration Observations

12. Adjustment to low energy
HRC-S QE
Fits to co-added HZ spectra
QE adjustment was based on the latest non-LTE pure H model atmospheres for HZ43 and Sirius B from the Tubingen group

13. LETG/HRC-S Zeroth Order Image Distortion
0.625” radius circle
CRSV98+99
CRSV100

14. Updated HRC-S De-Gap Map

15. Current Calibration Projects
LETG/HRC-S observations of HZ43 over the course of the mission
New HV
New HV

16. HRC-S High Voltage Test - Jan. 2012
LETG/HRC-S observations of HZ43

17. Current Calibration Projects
LETG/HRC-S observations of HZ43 over the course of the mission
New HV
New HV

18. LETG/HRC-S observations of Mkn 421 with old and new HV settings

19. LETG/HRC-S observations of Mkn 421 with old and new HV settings

20. New Time-Dependent ACIS QE Maps
ACIS-I3
ACIS-S3

21. Stability of HRC-I QE
HZ43 G
2.6 ± 0.8 % yr-1

22. Gain Calibration – ACIS-S1

23. ACIS Background

24. SAOTrace New Features – New Scattering Model
10’

25. Summary of Present Calibration Activities
Short term:
Release HRC-S QE for new HV setting
Release updated gain tables and OSIP files for ACIS BI chips
Release a set of time-dependent ACIS QE maps
Release Epoch F ACIS blank sky background images
Longer term:
ACIS
Continue to improve the contamination model
How variable is the charged particle background spectrum
Further cross-calibration studies

26. HRC
Improve the calibration of the intrinsic spatial response of the HRC (e.g., (two gaussians plus a Lorentzian)
Monitor the decline in the gain and QE of the HRC-I and determine if a time-dependent QE is required
Further cross-calibration studies
Update HRC-I QE map
HETG
Develop a science thread for the analysis of HETG/ACIS-S CC-mode data

27. LETG
Revisit cross-calibration between LETG and HETG at short wavelengths with the new HEG and MEG first order efficiencies.
Revisit C-K fine edge structure using new absorption coefficients for ISM C-K edges
Improve LETG/HRC-S EE fractions (i.e., the fraction of all events extracted in the cross-dispersion direction)
Improve the calibration of the LETGS resolving power

28. Comparision of optial depth at 700 eV derived from imaging and gratings data
ECS and A1795
LETG/ACIS-S