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GRB 190726A

GCN Circular 25154

Subject
GRB 190726A: Fermi GBM Final Real-time Localization
Date
2019-07-26T15:36:44Z (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 LONG GRB

At 15:24:53 UT on 26 Jul 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 190726A (trigger 585847498.610468 / 190726642).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 310.3, Dec = 34.3 (J2000 degrees, equivalent to J2000 20h 41m, 34d 17'), with a statistical uncertainty of 1.2 degrees.

The angle from the Fermi LAT boresight is 72.0 degrees.

The skymap can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190726642/quicklook/glg_skymap_all_bn190726642.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/bn190726642/quicklook/glg_healpix_all_bn190726642.fit

The GBM light curve can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190726642/quicklook/glg_lc_medres34_bn190726642.gif

GCN Circular 25155

Subject
GRB 190726A: BALROG localization (Fermi Trigger 585847498 / GRB 190726642)
Date
2019-07-26T15:59:52Z (6 years ago)
From
Jochen Greiner at MPE,Garching <jcg@mpe.mpg.de>
B. Biltzinger, F. Kunzweiler, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report:

The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
585847498 at 15:24:53 on 26 July 2019 were automatically fitted for spectrum
and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427;
Berlato et al. 2019, ApJ 873, 60).

The best-fit position (1 sigma statistical errors) is:
RA(2000.0) = 310.8+/-0.9 deg
Decl.(2000.0) = 34.9+/-1.2 deg
We estimate an additional systematic error of 2 deg.

Further details are available at:
https://grb.mpe.mpg.de/grb/GRB190726642/

The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB190726642/healpix

The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB190726642/json

GCN Circular 25305

Subject
GRB 190726A: Insight-HXMT/HE detection
Date
2019-08-09T13:00:51Z (6 years ago)
From
YaoGuang Zheng at IHEP <zhengyg@ihep.ac.cn>
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 2019-07-26T15:24:59.20 (T0), Insight-HXMT/HE detected 
GRB 190726A (trigger ID: HEB190726642) in a routine search of the data, 
which was also triggered by Fermi/GBM (GCN #25154).

The Insight-HXMT/HE light curve mainly consists of a single  
pulse with a duration (T90) of 2.94 s measured from T0-2.19 s. 
The 1-ms peak rate, measured from T0-1.91 s, is 1319 cnts/sec. 
The total counts from this burst is 3047 counts. 
URL_LC: http://www.hxmt.org/images/GRB/HEB190726642_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.

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