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TITLE:   GCN CIRCULAR
NUMBER:  25528
SUBJECT: GRB 190828D: A long GRB detected by INTEGRAL
DATE:    19/08/28 19:53:38 GMT
FROM:    Sandro Mereghetti at IASF-Milano/INAF  <sandro.mereghetti@inaf.it>

S.Mereghetti (INAF, IASF-Milano), D.Gotz (CEA, Saclay),  E.Bozzo,
C.Ferrigno, V.Savchenko (ISDC, Versoix), L.Ducci (IAAT, Germany and ISDC,
Versoix) and J.Borkowski (CAMK, Torun) report:

a gamma ray burst lasting about 20 s has been detected by IBAS in the
IBIS/ISGRI data at 18:48:30  UT of August 28, 2019.

The refined coordinates (J2000) are:

R.A.=   251.9247 deg
DEC.=   -24.5498 deg

with an uncertainty of  2.5   arcmin (90% c.l.).

The burst had a peak flux of  0.7    counts/cm2/s (20-200 keV, 1-s
integration  time) and a fluence in the same energy range of about 7e-7
erg/cmq.

A plot of the light curve will  be posted at
http://ibas.iasf-milano.inaf.it/IBAS_Results.html

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TITLE:   GCN CIRCULAR
NUMBER:  25576
SUBJECT: GRB 190828D: Insight-HXMT/HE detection
DATE:    19/08/30 12:59:32 GMT
FROM:    Qi Luo at IHEP  <luoqi@ihep.ac.cn>

J. M. Yao, Y. G. Zheng, C. Cai, Q. Luo, S. Xiao, Q. B. Yi, 
Y. Huang, C. K. Li, G. Li, X. B. Li, J. Y. Liao, S. L. Xiong,
C. Z. Liu, X. F. Li, Z. W. Li, Z. Chang, A. M. Zhang, 
Y. F. Zhang, X. F. Lu, C. L. Zou (IHEP), Y. J. Jin, 
Z. Zhang (THU), T. P. Li (IHEP/THU), F. J. Lu, L. M. Song, 
M. Wu, Y. P. Xu, S. N. Zhang (IHEP), 
report on behalf of the Insight-HXMT team:

At 2019-08-28T18:48:33.70 (T0), Insight-HXMT/HE detected 
GRB 190828D (trigger ID: HEB190828783) in a routine search of the data, 
which was also triggered by INTEGRAL (GCN #25528).

The Insight-HXMT/HE light curve mainly consists of multiple 
pulses with a duration (T90) of 5.21 s measured from T0+0.03 s. 
The 1-ms peak rate, measured from T0+0.03 s, is 4001 cnts/sec. 
The total counts from this burst is 5857 counts. 
URL_LC: http://www.hxmt.org/images/GRB/HEB190828783_lc.jpg 

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 
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.