TITLE: GCN CIRCULAR NUMBER: 37606 SUBJECT: Insight-HXMT ToO observations of X-ray bursts from SGR 1E 1841-045 / Kes 73 DATE: 24/09/25 06:13:38 GMT FROM: yqzhang_cl@163.com
Ce Cai (HEBNU), Xiao-Bo Li (IHEP), Shao-Lin Xiong (IHEP), Wang-Chen Xue (IHEP), Shuang-Nan Zhang (IHEP), Lin Lin (BNU) report on behalf of the Insight-HXMT team:
1E 1841-045 / Kes 73 has been in an active phase since August 20, 2024, as reported by Swift/BAT (DeLaunay et al., GCN 37211, Dichiara et al., GCN 37222), Fermi/GBM (Roberts et al., GCN 37234), GECAM-B (Zhang et al., GCN 37240), SVOM/GRM (Wang et al., GCN 37297). From 2024-08-23 16:13:43 UTC to 2024-08-29 10:02:44 UTC, Insight-HXMT observed 1E 1841-045 / Kes 73 under a public ToO (P0714005). Using different time resolutions (5 ms, 10 ms, 20 ms and 40 ms), we searched the data of Insight-HXMT/HE (NaI, 30-250 keV), ME (10-30 keV) and LE (1-10 keV). Assuming that bursts were separated by at least 1 second, Insight-HXMT detected five bursts during the six-day observation period. The X-ray bursts from this magnetar found in this public ToO observation are as follows:
Date and Time in UTC 2024-08-24T08:04:52.105 2024-08-25T00:00:13.655 2024-08-25T18:53:45.230 2024-08-26T15:44:10.390 2024-08-27T09:08:56.020
Detailed spectral and temporal analysis of these bursts will be reported elsewhere.
Insight-HXMT is the first Chinese space X-ray telescope, jointly funded by the China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). More information about it could be found at: http://hxmten.ihep.ac.cn/
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