{
  "bibcode": "2017GCN.21457....1L",
  "body": "J. Y. Liao, X. B. Li, C. K. Li, M. Y. Ge, Y. Huang, S. L. Xiong, Y. Liu,\nC. Z. Liu, X. F. Li, Z. W. Li, Z. Chang, X. F. Lu, J. L. Zhao,\nA. M. Zhang, Y. F. Zhang, C. L. Zou (IHEP), Y. J. Jin, Z. Zhang (THU),\nT. P. Li (IHEP/THU), F. J. Lu, L. M. Song, H. Y. Wang, M. Wu, Y. P. Xu,\nS. N. Zhang (IHEP), report on behalf of the Insight-HXMT team:\n\nInsight-HXMT was taking data normally around the LIGO trigger time\n(T0=2017-08-09 08:28:21.747 UTC). At T0, more than 95% of the LIGO\nlocalization region was covered by the Insight-HXMT without occultation\nby the Earth.\n\nWithin T0 +/- 1000 s, no significant events (SNR > 5 sigma) are found\nin a search of the Insight-HXMT raw light curves with time scales of\n20 ms, 50 ms, 0.2 s and 1 s, respectively.\nOnly one particle event lasting about 180 s was found at T0-680 s,\nwhich is caused by the orbital environment thus has no relation with\nthe LIGO event.\n\nWith the three typical GRB Band spectral models, three integration time\n(1 s, 10 s, and 100 s) and the LIGO localization region, the 3-sigma\nupper-limits fluence (0.2 - 5 MeV, incident energy) are reported below:\n\nBand model 1 (alpha=-1.9, beta=-3.7, Ep=70 keV):\n1s: 1.4e-07 to 2.6e-07 erg cm^-2\n10s: 4.5e-07 to 9.1e-07 erg cm^-2\n100s: 1.6e-06 to 3.1e-06 erg cm^-2\n\nBand model 2 (alpha=-1.0, beta=-2.3, Ep=230 keV):\n1s: 2.2e-07 to 3.9e-07 erg cm^-2\n10s: 7.2e-07 to 1.4e-06 erg cm^-2\n100s: 2.5e-06 to 4.6e-06 erg cm^-2\n\nBand model 3 (alpha=-0.0, beta=-1.5, Ep=1000 keV):\n1s: 5.2e-07 to 7.5e-07 erg cm^-2\n10s: 1.6e-06 to 2.5e-06 erg cm^-2\n100s: 5.8e-06 to 8.4e-06 erg cm^-2\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\nThe analysis results presented above are preliminary;\nrefined results will be reported later.\n\nInsight-HXMT is the first Chinese space X-ray telescope, which was funded\njointly by the China National Space Administration (CNSA) and the Chinese\nAcademy of Sciences (CAS). More information about it could be found at:\nhttp://www.hxmt.org/index.php/enhome .",
  "circularId": 21457,
  "createdOn": 1502462504000,
  "email": "xiongsl@ihep.ac.cn",
  "subject": "LIGO/Virgo G296853: Insight-HXMT observations",
  "submitter": "Shaolin Xiong at IHEP  <xiongsl@ihep.ac.cn>",
  "eventId": "LIGO/Virgo G296853"
}