DRAFT
2023-05-22 06:15:38
Type: Object/s-Data/Analysis
Bibcode: 2023TNSAN.130....1M
Onset of SN 2023ixf observed over East Asian longitudes
Authors: Yiming Mao, Mi Zhang, Guangyao Cai, Jinan Chen, Jin Chen, Xing Gao, Keying Li, Xiaodong Lyu, Yujing Qin, Guoyou Sun, Shijun Xu, Zangyun Zhang, Jiashuo Zhang, Jingyuan Zhao, Xin Zheng, Wenjie Zhou, Quanzhi Ye
Keywords: Photometry, Transient, Supernova, Optical
Abstract:
We present the observations made by several China-based amateur astronomers that cover the onset of SN 2023ixf. A serendipitous time-lapse observation of M 101 captured the onset of the supernova explosion and constrained the onset time at around 2023 May 18 19:30 to 20:30 UT.
Following the first detection by Koichi Itagaki, we collected images acquired by China-based amateur astronomers within a few days before the discovery and performed photometry at the position of SN 2023ixf. The onset of the supernova explosion was captured by a serendipitous imaging session by Yiming Mao using a 0.11-m f/6.5 refractor at Dabancheng, Xinjiang, China. Mao obtained 60 5-min exposures from 2023 May 18 16:05 to 21:26 UT. The supernova was invisible in a 11x5-min running stack centered at 19:32 UT but became visible in a 11x5-min stack centered at 20:29 UT.

The images were grossly calibrated to Bessel V magnitudes using UCAC4 catalog; however all images were taken without photometric filters or using a color camera, therefore these numbers should be treated with caution. We estimate that the total uncertainty is at the level of 0.1 mag.

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2023 May (UT)   Mag  Observer Instrument

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17 18:07   >20.3   Xing Gao   0.6-m f/8 Ritchey-Chretien

18 15:51*   >20.4   Jinan Chen   0.2-m f/7 Schmidt-Cassegrain

18 16:16   >18.7   Xin Zheng   0.15-m f/5 reflector

18 17:44*   >16.4   Shijun Xu   0.25-m f/4.8 reflector

18 19:32*   >17.8   Yiming Mao   0.11-m f/6.5 refractor

18 20:29*   17.7   Yiming Mao   0.11-m f/6.5 refractor

18 21:13*   17.6   Yiming Mao   0.11-m f/6.5 refractor

19 13:23   15.1   Xin Zheng   0.15-m f/5 reflector

19 14:02*   15.2   Jin Chen   0.10-m f/7 refractor

19 14:44   15.2   Guangyao Cai   0.13-m f/7 refractor

19 16:09*   15.1   Keying Li   0.08-m f/6 refractor

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*: Center time of the running stack of over 10 images.

Details of the observations are available athttp://xjltp.china-vo.org/sn2023ixf.html.

Show current TNS values
Catalog Name Reported RA Reported DEC Reported Obj-Type Reported Redshift Host Name Host Redshift Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2023ixf 14:03:38.564 +54:18:42.02 SN II 0.000804 M101 14:03:38.562 +54:18:41.94 SN II 0.0008

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