An investigation into the X-ray bursts in Cir X-1

We report 155 X-ray bursts from Cir X-1 detected with NICER and 48 with Insight-HXMT, respectively. The K-medoids clustering algorithm was applied to X-ray bursts detected by NICER for classification. These X-ray bursts are classified into two categories, designated as Class A and B. The profile of...

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Published inAstronomy and astrophysics (Berlin) Vol. 699; p. A130
Main Authors Yu, Zhuo-Li, Zhang, Shu, Zhang, Shuang-Nan, Li, Xiang-Dong, Chen, Yu-Peng, Peng, Jing-Qiang, Shui, Qing-Cang
Format Journal Article
LanguageEnglish
Published 01.07.2025
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Summary:We report 155 X-ray bursts from Cir X-1 detected with NICER and 48 with Insight-HXMT, respectively. The K-medoids clustering algorithm was applied to X-ray bursts detected by NICER for classification. These X-ray bursts are classified into two categories, designated as Class A and B. The profile of Class A resembles that of a typical type I X-ray burst. Class B is weaker and its profile is approximately symmetric. In these X-ray bursts, the shortest recurrence time of ∼300 s observed to date in Cir X-1 is detected. Additionally, no burst is detected prior to MJD 58933 in NICER and Insight-HXMT. The underlying reason for this phenomenon remains unclear and requires further investigation.
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361/202553748