TITLE: GCN CIRCULAR NUMBER: 36578 SUBJECT: GRB 240529A: Insight-HXMT/HE detection DATE: 24/05/31 02:38:28 GMT FROM: tanwj@ihep.ac.cn

Wenjun Tan, Shaolin Xiong , Xiaobo Li and Chengkui Li report on behalf of the Insight-HXMT team:

At 2024-05-29T02:58:31.000 (T0), Insight-HXMT/HE detected GRB 240529A(trigger ID: HEB240529123) in a routine search of the data, which was also observed by Swift (Eyles-Ferris et al. GCN 36556; C. B. Markwardt et al. GCN 36566).

The Insight-HXMT/HE light curve consists of multiple pulses with a duration (T90) of 66.23s measured from T0-37.26 s. The 1s peak rate, measured from T0-0.159 s, is 3138 cnts/sec. The total counts from this burst is 53027 counts. URL_LC: https://twikinew.ihep.ac.cn/pubhxmt/HXMT/GRBList/HEB240529123_lc.jpg

All measurements above are made with the CsI detectors operating in the regular mode with the energy range of about 80-800 keV (deposited energy). Only gamma-rays with energy greater than about 200 keV can penetrate the spacecraft and leave signals in the CsI detectors installed inside the telescope.

Insight-HXMT is the first Chinese space X-ray telescope, which was funded jointly by the China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). More information about it could be found at: http://hxmtweb.ihep.ac.cn/

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