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GRB 190813A

GCN Circular 25364

Subject

GRB 190813A: Insight-HXMT/HE detection

Date

2019-08-16T13:04:48Z (6 years ago)

From

Ce Cai at IHEP <caice@ihep.ac.cn>

C. Cai, Q. Luo, S. Xiao, Q. B. Yi, Y. G. Zheng, Y. Huang, 
C. K. Li, X. B. Li, G. 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 2019-08-13T12:29:09.94 (T0), Insight-HXMT/HE detected 
GRB 190813A (trigger ID: HEB190813520) in a routine search of the data, 
which was also triggered by Fermi/GBM (GCN #25317Loading...
 
 );
IPN Triangulation (GCN #25334Loading...
 
 ).

The Insight-HXMT/HE light curve mainly consists of a single  
pulse with a duration (T90) of 0.04 s measured from T0-0.05 s. 
The 1-ms peak rate, measured from T0-0.04 s, is 8523 cnts/sec. 
The total counts from this burst is 175 counts. 
URL_LC: http://www.hxmt.org/images/GRB/HEB190813520_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.

GCN Circular 25334

Subject

IPN triangulation of GRB 190813A (short)

Date

2019-08-15T10:43:27Z (6 years ago)

From

Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>

D. Svinkin and K. Hurley, on behalf of the IPN,

A. Goldstein, M. S. Briggs, and C. Wilson-Hodge
on behalf of the Fermi GBM team,

and

A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo,
and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,
report:

The short-duration GRB 190813A (The Fermi GBM team, GCN Circ. 25317Loading...
 
 )
was detected by Fermi (GBM trigger 587392154) and
INTEGRAL (SPI-ACS), at about 44950 s UT (12:29:10).

We have triangulated this GRB to a GBM-INTEGRAL annulus centered at
RA(2000)=96.795 deg (06h 27m 11s) Dec(2000)=-39.989 deg (-39d 59' 21"),
whose radius is 23.630 +/- 8.231 deg (3 sigma).

The IPN localization is consistent with, but reduces the area of, the 
Fermi-GBM one.

This annulus may be improved.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB190813_T44949/IPN/

GCN Circular 25317

Subject

GRB 190813A: Fermi GBM Final Real-time Localization

Date

2019-08-13T12:39:33Z (6 years ago)

From

Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>

The Fermi GBM team reports the detection of a likely SHORT GRB

At 12:29:09 UT on 13 Aug 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 190813A (trigger 587392154.943436 / 190813520).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 106.4, Dec = -23.3 (J2000 degrees, equivalent to J2000 07h 05m, -23d 18'), with a statistical uncertainty of 10.4 degrees.

The angle from the Fermi LAT boresight is 49.0 degrees.

The skymap can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190813520/quicklook/glg_skymap_all_bn190813520.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190813520/quicklook/glg_healpix_all_bn190813520.fit

The GBM light curve can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190813520/quicklook/glg_lc_medres34_bn190813520.gif