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GCN Circular 35060

GRB 231115A: Insight-HXMT/HE detection
2023-11-16T11:03:52Z (7 months ago)
Kai Kai <>
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W. C. Xue, S. L. Xiong, X. B. Li and C. K. Li
report on behalf of the Insight-HXMT team:

At 2023-11-15T15:36:21.200 (T0), Insight-HXMT/HE detected
GRB 231115A (trigger ID: HEB231115650) in a routine search of the data,
which was also observed by Fermi/GBM (Fermi GBM Team, GCN 35035 & 35044),
INTEGRAL (P. D'Avanzo et al., GCN 35036, S. Mereghetti et al. GCN 35037)
and Glowbug (C. C. Cheung et al., GCN 35045). This burst is probably a
giant flare from a magnetar in the nearby galaxy M82.

The Insight-HXMT/HE light curve mainly consists of single
pulse with a duration (T90) of 0.08 s measured from T0-0.01 s.
The 1-ms peak rate, measured from T0-0.01 s, is 16611 cnts/sec.
The total counts from this burst is 210 counts.

All measurements above are made with the CsI detectors operating in the
regular mode with the energy range of about 80-800 keV (deposited energy).
Only gamma-rays with energy greater than about 200 keV can penetrate
the spacecraft and leave signals in the CsI detectors installed inside
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:
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