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	LIGO/Virgo S190513bm: Insight-HXMT/HE observation
	Luo, Q; Cai, C; Yi, Q. B; Xiao, S; Li, C. K; Li, X. B; Li, G; Liao, J. Y; Xiong, S. L; Liu, C. Z
	2019-05-14
出处	GRB Coordinates Network
英文摘要	Insight-HXMT was taking data normally around the reported LIGO/Virgo S190513bm event (GCN #24522), trigger time T0=2019-05-13 20:54:28.747 UTC. At T0, about 42% of the LIGO localization region was covered by Insight-HXMT without occultation by the Earth.By searching the Insight-HXMT/HE raw light curves within T0 +/- 100 s, we found that there is one excess with a significance of 4.3 sigma from T0 + 8.50 s to T0 + 8.65 s. After an initial investigation, we believe that this signal is very likely due to background fluctutations and thus unrelated to the GW event.Assuming the GW counterpart GRB with three typical GRB Band spectral models, two typical duration timescales(1 s, 10 s) from the peak position of the LIGO-Virgo location probability map, the 5-sigma upper-limits fluence (0.2 - 5 MeV, incident energy) are reported below:Band model 1 (alpha=-1.9, beta=-3.7, Ep=70 keV):1 s: 2.8e-07 erg cm^-210 s: 1.1e-06 erg cm^-2Band model 2 (alpha=-1.0, beta=-2.3, Ep=230 keV):1 s: 4.0e-07 erg cm^-210 s: 1.8e-06 erg cm^-2Band model 3 (alpha=-0.0, beta=-1.5, Ep=1000 keV):1 s: 5.3e-07 erg cm^-210 s: 2.8e-06 erg cm^-2All measurements above are made with the CsI detectors operating in theregular mode with the energy range of about 80-800 keV (deposited energy).Only gamma-rays with energy greater than about 200 keV can penetratethe spacecraft and leave signals in the CsI detectors installed insideof the telescope.
内容类型	GCN
源URL	[http://ir.ihep.ac.cn/handle/311005/287623]
专题	硬X射线调制望远镜卫星 高能物理研究所_多学科研究中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Luo, Q,Cai, C,Yi, Q. B,et al. LIGO/Virgo S190513bm: Insight-HXMT/HE observation. 2019.

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