Insight-HXMT observation of GRB221009A/Swift J1913.1+1946

ATel #15660; W. J. Tan, C. K. Li, M. Y. Ge, X. B. Li, S. L. Xiong, S. N. Zhang (IHEP) report on behalf of the Insight-HXMT team
on 11 Oct 2022; 01:26 UT
Credential Certification: Yu-Peng Chen (chenyp@ihep.ac.cn)

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At 2022-10-09T13:17:00.050 (T0), Insight-HXMT/HE detected GRB 221009A (trigger ID: HEB221009553) in a routine search of the data, which also triggered Swift BAT (GCN #32635), Fermi GBM (GCNs # 32636), Fermi LAT(GCN #32637), and IPN (GCN #32641).

URL_LC: http://twiki.ihep.ac.cn/pub/HXMT/GRBList/HEB221009553.png

GRB 221009A consists of three parts in the light curve including a precusor around 180 seconds ahead, which is among the longest separation between the precursor and the main burst of a GRB. We note that this precusor is also visible in the GBM data. This GRB is so bright that there is a significant saturation effect (data loss) during bright parts of this GRB in the Insight-HXMT data. Further timing and spectral analysis of Insight-HXMT data is ongoing and will be reported later.

All measurements above are made with the CsI detectors operating in the low gain mode with the energy range of about 200-3000 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 of the telescope.

Insight-HXMT is China's first X-ray astronomy satellite, 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://www.hxmt.org.