Insight-HXMT X-ray and hard X-ray upper limits to the radio burst detected by FAST from SGR 1935+2154
ATel #13703; C. K. Li, Y. L. Tuo, M. Y. Ge, X. B. Li, J. Y. Liao, C. Cai, S. L. Xiong, C. Z. Liu, Y. Chen, X. L. Cao (IHEP), T. P. Li (IHEP/THU), S. M. Jia, J. Y. Nie, F. J. Lu, L. M. Song, M. Wu, Y. P. Xu, S. N. Zhang (IHEP), L. Lin (BNU), B. Zhang (UNLV), report on behalf of the Insight-HXMT team:
on 3 May 2020; 15:49 UT
Credential Certification: Shaolin Xiong (xiongsl@ihep.ac.cn)
Subjects: X-ray, Gamma Ray, Soft Gamma-ray Repeater, Fast Radio Burst
Around the trigger time (T0=2020-04-30T21:43:00.5 UTC) of the highly
polarised radio burst event reported by FAST (ATel #13699),
Insight-HXMT was carrying out the ToO observation
of SGR 1935+2154 without any occultation by the Earth.
Within T0 +/- 50 s, no significant excess events (SNR > 3 sigma)
are found in a search of the Insight-HXMT LE (1-10 keV), ME(10-30 keV)
and HE (27-250 keV) light curves.
Assuming the same spectral
model to the X-ray counterpart that we reported in ATel #13687,
and with one second timescale (1 s) coming from the position
of SGR1935+2154, the 3-sigma fluence upper-limits are as following:
Model: wabs*Cutoffpl (nH=2.6,PhoIndex=1.44, Ecut=69.8 keV):
LE: 2.68e-09 erg cm^-2
ME: 3.45e-09 erg cm^-2
HE: 4.46e-09 erg cm^-2
Insight-HXMT will continue to observe SGR 1935+2154 with LE, ME and HE
until 2020-05-06 01:20:47 UT.
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 could be found at: http://www.hxmt.org.
