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

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 2003-2005: Funded by NSFC for pre-phase A 2003: Connected with COROT and MONS 2004: Proposed as a candidate proposal for Sino-France cooperation

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

MOST

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, ……

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.

Optical Photometric telescope: Diameter: 30cm, f/7 E2V 47-20 1024*1024 frame-transfer CCD FOV: ~22*22acrmin 4000-8500 Å Integrating time: 1 min R=15.0m; ±0.01

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, ±0.00005 For seismology and high accurate photometry

Frame-transfer CCD Marconi 47-20

Wild-field Photometric telescope: Diameter: 16cm, f/1.56 E2V 47-20 FOV: 3*3 degrees 4000-8500 Å Integrating time: 1 min R=15.0m; ±0.02 For Exoplanet searching

Wide-field X-ray telescopes: Soft X-ray telescope: Spectral resolution: 150-300 eV Accuracy of position: 2-5 arcmin. Range of energy: 0.5-20 keV Field of View: 20 degrees Hard X-ray telescope: Range of energy: 20-300 keV

Optical patrol telescope 40mm lens, f/1.0 E2V 47-20 1024  1024 frame-transfer CCD FOV: ~20 20 degree2 Integrating time: 1min m=15m, ±0.04 Star sensor and wide-field monitor

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.

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