{
  "bibcode": "2020GCN.27250....1L",
  "body": "Q. Luo, Y. G. Zheng, C. Cai, Y. F. Du, W. C. Xue, \nS. Xiao, Q. B. Yi, Y. Huang, C. K. Li, G. Li, \nX. B. Li, J. Y. Liao, S. L. Xiong,C. Z. Liu, \nX. F. Li, Z. W. Li, Z. Chang, A. M. Zhang, Y. F. Zhang, \nX. F. Lu, C. L. Zou (IHEP), Y. J. Jin, Z. Zhang (THU), \nT. P. Li (IHEP/THU), F. J. Lu, L. M. Song, \nM. Wu, Y. P. Xu, S. N. Zhang (IHEP), \nreport on behalf of the Insight-HXMT team:\n\nInsight-HXMT was taking data normally around the trigger time\n(T0=2020-02-27T05:36:31.50 UTC) of this high-energy neutrino \ncandidate event (GCN #27235), which was monitored without \nany occultation by the Earth. \n\nWithin T0 +/- 100 s, no significant excess events (SNR > 4 sigma) \nare found in a search of the Insight-HXMT/HE raw light curves.\n\nAssuming the counterpart GRB with three typical GRB Band spectral \nmodels, two typical duration timescales(1 s, 10 s) coming from the position\nof this neutrino event, the 5-sigma upper-limits fluence \n(0.2 - 5 MeV, incident energy) are reported below:\n\nBand model 1 (alpha=-1.9, beta=-3.7, Ep=70 keV):\n1s:  1.0e-07 erg cm^-2   \n10s: 9.3e-07 erg cm^-2 \n\nBand model 2 (alpha=-1.0, beta=-2.3, Ep=230 keV):\n1s:  1.6e-07 erg cm^-2   \n10s: 1.5e-06 erg cm^-2\n\nBand model 3 (alpha=-0.0, beta=-1.5, Ep=1000 keV):\n1s:  3.3e-07 erg cm^-2  \n10s: 2.6e-06 erg cm^-2 \n\nFurther analysis will be reported in the following circulars.\n\nAll measurements above are made with the CsI detectors operating in the\nregular mode with the energy range of about 80-800 keV (record energy).\nOnly gamma-rays with energy greater than about 200 keV can penetrate\nthe spacecraft and leave signals in the CsI detectors installed inside\nof the telescope.\n\nInsight-HXMT is the first Chinese space X-ray telescope, which was \nfundedjointly by the China National Space Administration (CNSA) and \nthe Chinese Academy of Sciences (CAS). \nMore information could be found at: http://www.hxmt.org.",
  "circularId": 27250,
  "createdOn": 1582877868000,
  "email": "luoqi@ihep.ac.cn",
  "subject": "IceCube-200227A : Upper limits from Insight-HXMT/HE observations",
  "submitter": "Qi Luo at IHEP  <luoqi@ihep.ac.cn>",
  "eventId": "IceCube-200227A"
}