GRB 190726B
GCN Circular 25157
Subject
GRB 190726B: Fermi GBM Final Real-time Localization
Date
2019-07-26T20:25:31Z (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 20:14:30 UT on 26 Jul 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 190726B (trigger 585864875.561318 / 190726843).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 342.7, Dec = -56.0 (J2000 degrees, equivalent to J2000 22h 50m, -56d 00'), with a statistical uncertainty of 2.4 degrees.
The angle from the Fermi LAT boresight is 67.0 degrees.
The skymap can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190726843/quicklook/glg_skymap_all_bn190726843.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/bn190726843/quicklook/glg_healpix_all_bn190726843.fit
The GBM light curve can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190726843/quicklook/glg_lc_medres34_bn190726843.gif
GCN Circular 25158
Subject
GRB 190726B: BALROG localization (Fermi Trigger 585864875 / GRB 190726843)
Date
2019-07-26T20:35:57Z (6 years ago)
From
Jochen Greiner at MPE,Garching <jcg@mpe.mpg.de>
F. Kunzweiler, B. Biltzinger, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
585864875 at 20:14:30 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) = 328.2+/-5.5 deg
Decl.(2000.0) = -48.3+/-1.9 deg
We estimate an additional systematic error of 1 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB190726843/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB190726843/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB190726843/json
GCN Circular 25247
Subject
GRB 190726B: AstroSat CZTI detection
Date
2019-08-01T11:12:22Z (6 years ago)
From
Prachee Ghumatkar at IUCAA/AstroSat <prachee@iucaa.in>
P. Ghumatkar, V. Sharma and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data showed the detection of a long GRB 190726B, which was also detected by Fermi GBM (GCN #25157), BALROG localization (Kunzweiler F. et al., GCN #25158) and Global MASTER-Net (Lipunov V. et al., GCN #25161).
The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple pulses of emission with strongest peak at 20:14:54.0 UT. The measured peak count rate associated with the burst is 253 cts/s above the background in the combined data of four quadrants, with a total of 11142 cts. The local mean background count rate was 508 cts/s. Using cumulative rates, we measure a T90 of 209.0 s. In preliminary analysis, we find that 478 Compton events are associated with this event.
It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range.
CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated the project.