SVOM/VT: Preliminary Calibration Analysis
Fuente:
arXiv
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| Autori principali: | , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866917439444353024 |
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| author | Yao, Zhu-Heng Qiu, Yu-Lei Deng, Jin-Song Xin, Li-Ping Wu, Chao Li, Hua-Li Wang, Jing Ma, Yi-Nuo Cai, Hong-Bo Han, Xu-Hui Wei, Jian-Yan Cordier, Betrand |
| author_facet | Yao, Zhu-Heng Qiu, Yu-Lei Deng, Jin-Song Xin, Li-Ping Wu, Chao Li, Hua-Li Wang, Jing Ma, Yi-Nuo Cai, Hong-Bo Han, Xu-Hui Wei, Jian-Yan Cordier, Betrand |
| contents | We present the in-orbit calibration of the Visible Telescope (VT), one of the key instruments aboard the Space Variable Objects Monitor (SVOM) mission for gamma-ray burst (GRB) studies. Using Gaia Data Release 3 (DR3) as a reference, the VT achieves an astrometric precision better than 0.03'' for bright stars, degrading to ~0.25'' for faint targets. Shortly after launch, contamination was detected, reducing system transmission by ~40%. An initial bake-out successfully restored performance, but gradual recontamination caused transmission to decline by ~20% over the following 100 days before stabilizing. Despite this effect, routine standard star observations maintain precise zero-point calibration, ensuring a photometric stability of 0.02 mag. Using synthetic stellar spectra, we derived photometric transformations to the Gaia, SDSS, and Johnson-Cousins systems with typical residuals of 0.03 mag. These results demonstrate the VT system's capability and reliability in calibrating GRBs and other transients. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_24256 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | SVOM/VT: Preliminary Calibration Analysis Yao, Zhu-Heng Qiu, Yu-Lei Deng, Jin-Song Xin, Li-Ping Wu, Chao Li, Hua-Li Wang, Jing Ma, Yi-Nuo Cai, Hong-Bo Han, Xu-Hui Wei, Jian-Yan Cordier, Betrand High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics We present the in-orbit calibration of the Visible Telescope (VT), one of the key instruments aboard the Space Variable Objects Monitor (SVOM) mission for gamma-ray burst (GRB) studies. Using Gaia Data Release 3 (DR3) as a reference, the VT achieves an astrometric precision better than 0.03'' for bright stars, degrading to ~0.25'' for faint targets. Shortly after launch, contamination was detected, reducing system transmission by ~40%. An initial bake-out successfully restored performance, but gradual recontamination caused transmission to decline by ~20% over the following 100 days before stabilizing. Despite this effect, routine standard star observations maintain precise zero-point calibration, ensuring a photometric stability of 0.02 mag. Using synthetic stellar spectra, we derived photometric transformations to the Gaia, SDSS, and Johnson-Cousins systems with typical residuals of 0.03 mag. These results demonstrate the VT system's capability and reliability in calibrating GRBs and other transients. |
| title | SVOM/VT: Preliminary Calibration Analysis |
| topic | High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2604.24256 |