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AT2018cow: Insight-HXMT/HE data search

ATel #11799; Yue Huang (IHEP), Jinyuan Liao (IHEP), Mingyu Ge (IHEP), Shaolin Xiong (IHEP), Shu Zhang (IHEP), Jinlu Qu (IHEP), Fangjun Lu (IHEP), Lingming Song (IHEP), Shuangnan Zhang (IHEP) and Insight-HXMT Collaboration
on 30 Jun 2018; 14:17 UT
Credential Certification: Yue Huang (huangyue@ihep.ac.cn)

Subjects: X-ray, Gamma Ray, Transient

We report the search results of AT2018cow (Smartt et al., ATel #11727) in the Insight-HXMT/HE data. At T0 (2018-06-16 10:35:02 UTC), the source location (RA=244.00090, Dec=22.26800) was covered by Insight-HXMT/HE without occultation by the Earth. Within T0 +/- 100s, no significant detections (SNR>5) are found in a search of the Insight-HXMT/HE raw light curves with time bins of 0.1s and 1s, respectively. Assuming a typical GRB Band spectral (alpha=-1.9, beta=-3.7, Epeak=70 keV), the 3-sigma upper limit for the source flux is 7.7e-8 ergs/cm^2/s (0.2-5 MeV, incident energy). All measurements above are made with the CsI detectors operating in the regular mode with the energy range of about 80-800 keV (record 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 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://www.hxmt.org.