1. The Scientific Goals for Astronomical Satellite
National Astronomical Observatory,
CAS, China

2. History of the proposal
2000.6: Space-based Variable objects Monitor (SVOM) proposed by NAOC
Got support from CAS
2002.7: Reviewed by committee,
One of the most promising micro-satellite proposal
: Funded by NSFC for pre-phase A
2003: Connected with COROT and MONS
2004: Proposed as a candidate proposal for Sino-France cooperation

3. Similar astronomical satellites
MOST ( Canada)
COROT (France)
SWIFT (USA)

4. MOST

6. Scientific Goals Stellar seismology ( as MOST,COROT)
Searching for Exoplanet (as COROT)
Monitoring GRB after-glows (as SWIFT)
Studying XRF( high-z GRB?)
X-ray/Optical simultaneously observations:
AGNe, X-binary, CVs, Solar-like activities, ……

7. The Payload of SVOM
Optical photometric telescope Wide-field optical telescope Wide-field X-ray telescopes Optical patrol telescope The optical axies of the four telescopes are parallel in the normal case.

8. Optical Photometric telescope:
Diameter: 30cm, f/7
E2V *1024 frame-transfer CCD
FOV: ~22*22acrmin Å
Integrating time: 1 min
R=15.0m; ±0.01

9. Optical Photometric telescope:
Using a quarter of FOV with an array of micro-lens as Fabry lens to avoid CCD saturation during observing bright stars and decrease the effect of un-uniformity of CCD’s response.
Integrating time: 1min
m=10m, ±0.0005
5m, ±
For seismology and high accurate photometry

10. Frame-transfer CCD Marconi 47-20

11. Wild-field Photometric telescope:
Diameter: 16cm, f/1.56
E2V 47-20
FOV: 3*3 degrees Å
Integrating time: 1 min
R=15.0m; ±0.02
For Exoplanet searching

12. Wide-field X-ray telescopes:
Soft X-ray telescope:
Spectral resolution: eV
Accuracy of position: 2-5 arcmin.
Range of energy: keV
Field of View: 20 degrees
Hard X-ray telescope:
Range of energy: keV

13. Optical patrol telescope
40mm lens, f/1.0
E2V  1024
frame-transfer CCD
FOV: ~20 20 degree2
Integrating time: 1min
m=15m, ±0.04
Star sensor and wide-field monitor

14. Operating modes Normal mode: Seismology X-ray/optical monitoring
X-ray trigger mode:
The optical photometric telescope points to the place of X-ray source. (2~3 times per year)
The wide-field optical telescope is always for exoplanets.

15. Thanks!