| Optical Transient Source AT2021lfa: A Possible “Dirty Fireball” |
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| 作者姓名： | Xue-Mei Ye Da-Ming Wei Yi-Ming Zhu Zhi-Ping Jin |
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| 作者单位： | 1. Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences;2. School of Astronomy and Space Science, University of Science and Technology of China;3. National Astronomical Observatories/Nanjing Institute of Astronomical Optics & Technology, Chinese Academy of Sciences;4. CAS Key Laboratory of Astronomical Optics & Technology, Nanjing Institute of Astronomical Optics & Technology |
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| 基金项目： | supported by the National Natural Science Foundation of China (NSFC, grant Nos. 12073080, 11933010, 11921003, 12233011, and 12225305)； |
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| 摘 要： | AT2021lfa,also known as ZTF21aayokph,was detected by the Zwicky Transient Facility on 2021 May 4,a 05:34:48 UTC.Follow-up observations were conducted using a range of ground-based optical telescopes,as wel as Swift/XRT and VLA instruments.AT2021lfa is classified as an“orphan afterglow”candidate due to its rapid flux decline and its reddened color (g-r=0.17±0.14 mag).For an optical transient source without promp gamma-ray detection,one key point is to determine its burst time.Here we measure the ...
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