Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 21274

GRB 170626A: Insight-HXMT observation
2017-06-27T15:29:39Z (7 years ago)
Shaolin Xiong at IHEP <>
Y. P. Xu, M. Y. Ge, S. L. Xiong, C. Z. Liu, X. F. Li, Z. W. Li,
J. Y. Liao, X. B. Li, C. K. Li, Y. Huang, Z. Chang, X. F. Lu,
J. L. Zhao, A. M. Zhang, Y. F. Zhang, C. L. Zou (IHEP), Y. J. Jin,
Z. Zhang (THU), Y. P. Chen, M. Gao (IHEP), T. P. Li (IHEP/THU),
G. Li, M. S. Li, H. W. Liu, F. J. Lu, L. M. Song, W. H. Tao, H. Y. Wang,
Y. H. Wang, X. Y. Wen, M. Wu, H. Xu, C. M. Zhang, F. Zhang, J. Zhang,
T. Zhang, S. N. Zhang (IHEP), report on behalf of the Insight-HXMT team:

During the commissioning phase, at 2017-06-26T09:37:22.32 (T0),
Insight-HXMT detected GRB 170626A (trigger ID: HEB170626400)
in a routine search of the data, which was also observed by the Swift/BAT
(Marshall et al. 2017, GCN 21264) and the Fermi/GBM
(Hamburg et al. 2017, GCN 21266).

The Insight-HXMT light curve mainly consists of several pulses
with a duration (T90) of 12.1 s measured from T0-0.43 s.
The 1-second peak rate, measured from T0+0.5 s, is 3275.0 cnts/sec.
The total counts from this burst is 9887 counts.
All measurements above are made with the CsI detectors in the energy range
of about 80-840 keV. Please note that this is the deposited energy,
rather than the incident photon energy.


The time-averaged spectrum from T0-2.5s to T0+12.5 s is
adequately fit by a Power Law model with spectral index = -1.85 +/- 0.03.
The event fluence (200 -50000 keV) in this time interval is
(1.86 +/- 0.09)E-05 erg/cm^2.

The analysis results presented above are preliminary;
final results will be published elsewhere.

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 this telescope could be found at: .
Looking for U.S. government information and services? Visit