GRB 200619A

S. Xiao, Y. G. Zheng, C. Cai, Y. F. Du, W. C. Xue, 
Q. Luo, 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 2020-06-19T02:36:11.60 (T0), Insight-HXMT/HE detected 
GRB 200619A (trigger ID: HEB200619108) in a routine search of the data, 
which also triggered Fermi/GBM and INTEGRAL (EXB 200619108).

The Insight-HXMT/HE light curve mainly consists of multiple 
pulses with a duration (T90) of 18.49 s measured from T0+0.35 s. 
The 1-ms peak rate, measured from T0-0.04 s, is 2889 cnts/sec. 
The total counts from this burst is 14248 counts. 
URL_LC: http://twiki.ihep.ac.cn/pub/HXMT/GRBList/HEB200619108_lc.jpg

All measurements above are made with the CsI detectors operating in the 
normal 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.

A. Ursi (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), F.
Longo (Univ. Trieste and INFN Trieste), N. Parmiggiani (INAF/OAS-Bologna),
F. Lucarelli, C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), A. Argan, M.
Cardillo, C. Casentini, Y. Evangelista, G. Piano (INAF/IAPS), A.
Bulgarelli, V. Fioretti, F. Fuschino, (INAF/OAS-Bologna), M. Marisaldi
(INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois
(INAF/OA-Cagliari), I. Donnarumma (ASI), A. Giuliani (INAF/IASF-Mi), report
on behalf of the AGILE Team:

The AGILE satellite detected the GRB 200619A reported by Insight-HXMT/HE
(Xiao et al., GCN #27985
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 ), occurring at T0 = 2020-06-19T02:36:11.60 +/-
0.01 s (UTC).

The event is visible in the scientific ratemeters (RMs) of the
Anti-Coincidence (AC, 80-200 keV) and Mini-Calorimeter (MCAL, 0.4-100 MeV)
detectors. Their light curves show a FRED profile, lasting ~15 s and
releasing ~54380 counts in the AC RMs and ~22675 counts in the MCAL RMs.
The ratemeters light curves can be found at
http://www.agilescienceapp.it/notices/RM_GRB200619A.png .

Additional analysis of AGILE data is in progress.

C. Fletcher (USRA) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:

"At 02:36:11.67 UT on 19 June 2020, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 200619A (trigger 614226976 / 200619108).
This burst was also detected by the AGILE satellite (A. Ursi et al. 2020, GCN 27991
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 )
and Insight-HXMT/HE (S. Xiao et al. 2020, GCN 27985
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 ).

The on-ground calculated location, using the GBM trigger
data, is RA = 101.4, DEC = 56.7 (J2000 degrees,
equivalent to 06h 45m, 56d 44'), with a statistical uncertainty
of 4.0 degrees (radius, 1-sigma containment,
statistical only; there is additionally a systematic
error which we have characterized as a core-plus-tail model, with 90% of
GRBs having a 3.7 deg error and a small tail suffering a larger than 10 deg
systematic error. [Connaughton et al. 2015, ApJS, 216, 32] ).

The angle from the Fermi LAT boresight at the GBM trigger time is 103 degrees.

The GBM light curve consists of a single bright peak
with a duration (T90) of about 29 s (50-300 keV).
The time-averaged spectrum from T0+0.003 s to T0+29.120 s is
best fit by a power law function with an exponential
high-energy cutoff.  The power law index is -0.82 +/- 0.06 and
the cutoff energy, parameterized as Epeak, is 1268 +/- 199 keV.

The event fluence (10-1000 keV) in this time interval is
(1.42 +/- 0.04)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+0.064 s in the 10-1000 keV band
is 4.8 +/- 0.4 ph/s/cm^2.

The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog:
https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html

For Fermi GBM data and info, please visit the official Fermi GBM Support Page:
https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"